diff --git a/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java b/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java
index de3c2737e11..3f3c4a0813d 100644
--- a/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java
+++ b/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirBlackBoxCodegenTestGenerated.java
@@ -30136,6 +30136,18 @@ public class FirBlackBoxCodegenTestGenerated extends AbstractFirBlackBoxCodegenT
             runTest("compiler/testData/codegen/box/properties/kt4383.kt");
         }
 
+        @Test
+        @TestMetadata("kt49203_lateinit.kt")
+        public void testKt49203_lateinit() throws Exception {
+            runTest("compiler/testData/codegen/box/properties/kt49203_lateinit.kt");
+        }
+
+        @Test
+        @TestMetadata("kt49203_var.kt")
+        public void testKt49203_var() throws Exception {
+            runTest("compiler/testData/codegen/box/properties/kt49203_var.kt");
+        }
+
         @Test
         @TestMetadata("kt613.kt")
         public void testKt613() throws Exception {
diff --git a/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/ir/Fir2IrTextTestGenerated.java b/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/ir/Fir2IrTextTestGenerated.java
index b577b36c16d..ae88d361776 100644
--- a/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/ir/Fir2IrTextTestGenerated.java
+++ b/compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/ir/Fir2IrTextTestGenerated.java
@@ -1466,6 +1466,12 @@ public class Fir2IrTextTestGenerated extends AbstractFir2IrTextTest {
             runTest("compiler/testData/ir/irText/expressions/kt48806.kt");
         }
 
+        @Test
+        @TestMetadata("kt49203.kt")
+        public void testKt49203() throws Exception {
+            runTest("compiler/testData/ir/irText/expressions/kt49203.kt");
+        }
+
         @Test
         @TestMetadata("lambdaInCAO.kt")
         public void testLambdaInCAO() throws Exception {
diff --git a/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/AssignmentGenerator.kt b/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/AssignmentGenerator.kt
index 763ca39521b..5f034b45c28 100644
--- a/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/AssignmentGenerator.kt
+++ b/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/AssignmentGenerator.kt
@@ -17,10 +17,7 @@
 package org.jetbrains.kotlin.psi2ir.generators
 
 import com.intellij.psi.tree.IElementType
-import org.jetbrains.kotlin.descriptors.ClassDescriptor
-import org.jetbrains.kotlin.descriptors.PropertyDescriptor
-import org.jetbrains.kotlin.descriptors.TypeParameterDescriptor
-import org.jetbrains.kotlin.descriptors.ValueDescriptor
+import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.impl.LocalVariableDescriptor
 import org.jetbrains.kotlin.descriptors.impl.SyntheticFieldDescriptor
 import org.jetbrains.kotlin.ir.builders.irBlock
@@ -322,6 +319,7 @@ class AssignmentGenerator(statementGenerator: StatementGenerator) : StatementGen
         val unwrappedPropertyDescriptor = resultingDescriptor.unwrapPropertyDescriptor()
         val getterDescriptor = unwrappedPropertyDescriptor.unwrappedGetMethod
         val setterDescriptor = unwrappedPropertyDescriptor.unwrappedSetMethod
+            ?.takeUnless { it.visibility == DescriptorVisibilities.INVISIBLE_FAKE }
 
         val getterSymbol = getterDescriptor?.let { context.symbolTable.referenceSimpleFunction(it.original) }
         val setterSymbol = setterDescriptor?.let { context.symbolTable.referenceSimpleFunction(it.original) }
diff --git a/compiler/testData/codegen/box/properties/kt49203_lateinit.kt b/compiler/testData/codegen/box/properties/kt49203_lateinit.kt
new file mode 100644
index 00000000000..28f20f62c05
--- /dev/null
+++ b/compiler/testData/codegen/box/properties/kt49203_lateinit.kt
@@ -0,0 +1,25 @@
+class X {
+    var value = ""
+
+    operator fun plusAssign(data: String) {
+        value += data
+    }
+}
+
+abstract class A {
+    lateinit var x: X
+        private set
+
+    fun init() {
+        x = X()
+    }
+}
+
+class B : A()
+
+fun box(): String {
+    val a = B()
+    a.init()
+    a.x += "OK"
+    return a.x.value
+}
\ No newline at end of file
diff --git a/compiler/testData/codegen/box/properties/kt49203_var.kt b/compiler/testData/codegen/box/properties/kt49203_var.kt
new file mode 100644
index 00000000000..b5245a6a052
--- /dev/null
+++ b/compiler/testData/codegen/box/properties/kt49203_var.kt
@@ -0,0 +1,20 @@
+class X {
+    var value = ""
+
+    operator fun plusAssign(data: String) {
+        value += data
+    }
+}
+
+abstract class A {
+    var x: X = X()
+        private set
+}
+
+class B : A()
+
+fun box(): String {
+    val a = B()
+    a.x += "OK"
+    return a.x.value
+}
\ No newline at end of file
diff --git a/compiler/testData/ir/irText/expressions/kt49203.fir.ir.txt b/compiler/testData/ir/irText/expressions/kt49203.fir.ir.txt
new file mode 100644
index 00000000000..651eace0334
--- /dev/null
+++ b/compiler/testData/ir/irText/expressions/kt49203.fir.ir.txt
@@ -0,0 +1,150 @@
+FILE fqName:<root> fileName:/kt49203.kt
+  CLASS CLASS name:X modality:FINAL visibility:public superTypes:[kotlin.Any]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.X
+    CONSTRUCTOR visibility:public <> () returnType:<root>.X [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:X modality:FINAL visibility:public superTypes:[kotlin.Any]'
+    PROPERTY name:value visibility:public modality:FINAL [var]
+      FIELD PROPERTY_BACKING_FIELD name:value type:kotlin.String visibility:private
+        EXPRESSION_BODY
+          CONST String type=kotlin.String value=""
+      FUN DEFAULT_PROPERTY_ACCESSOR name:<get-value> visibility:public modality:FINAL <> ($this:<root>.X) returnType:kotlin.String
+        correspondingProperty: PROPERTY name:value visibility:public modality:FINAL [var]
+        $this: VALUE_PARAMETER name:<this> type:<root>.X
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public final fun <get-value> (): kotlin.String declared in <root>.X'
+            GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:value type:kotlin.String visibility:private' type=kotlin.String origin=null
+              receiver: GET_VAR '<this>: <root>.X declared in <root>.X.<get-value>' type=<root>.X origin=null
+      FUN DEFAULT_PROPERTY_ACCESSOR name:<set-value> visibility:public modality:FINAL <> ($this:<root>.X, <set-?>:kotlin.String) returnType:kotlin.Unit
+        correspondingProperty: PROPERTY name:value visibility:public modality:FINAL [var]
+        $this: VALUE_PARAMETER name:<this> type:<root>.X
+        VALUE_PARAMETER name:<set-?> index:0 type:kotlin.String
+        BLOCK_BODY
+          SET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:value type:kotlin.String visibility:private' type=kotlin.Unit origin=null
+            receiver: GET_VAR '<this>: <root>.X declared in <root>.X.<set-value>' type=<root>.X origin=null
+            value: GET_VAR '<set-?>: kotlin.String declared in <root>.X.<set-value>' type=kotlin.String origin=null
+    FUN name:plusAssign visibility:public modality:FINAL <> ($this:<root>.X, data:kotlin.String) returnType:kotlin.Unit [operator]
+      $this: VALUE_PARAMETER name:<this> type:<root>.X
+      VALUE_PARAMETER name:data index:0 type:kotlin.String
+      BLOCK_BODY
+        CALL 'public final fun <set-value> (<set-?>: kotlin.String): kotlin.Unit declared in <root>.X' type=kotlin.Unit origin=EQ
+          $this: GET_VAR '<this>: <root>.X declared in <root>.X.plusAssign' type=<root>.X origin=null
+          <set-?>: CALL 'public final fun plus (other: kotlin.Any?): kotlin.String [operator] declared in kotlin.String' type=kotlin.String origin=null
+            $this: CALL 'public final fun <get-value> (): kotlin.String declared in <root>.X' type=kotlin.String origin=GET_PROPERTY
+              $this: GET_VAR '<this>: <root>.X declared in <root>.X.plusAssign' type=<root>.X origin=null
+            other: GET_VAR 'data: kotlin.String declared in <root>.X.plusAssign' type=kotlin.String origin=null
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  CLASS CLASS name:A modality:ABSTRACT visibility:public superTypes:[kotlin.Any]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.A
+    CONSTRUCTOR visibility:public <> () returnType:<root>.A [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:A modality:ABSTRACT visibility:public superTypes:[kotlin.Any]'
+    PROPERTY name:x visibility:public modality:FINAL [lateinit,var]
+      FIELD PROPERTY_BACKING_FIELD name:x type:<root>.X visibility:private
+      FUN DEFAULT_PROPERTY_ACCESSOR name:<get-x> visibility:public modality:FINAL <> ($this:<root>.A) returnType:<root>.X
+        correspondingProperty: PROPERTY name:x visibility:public modality:FINAL [lateinit,var]
+        $this: VALUE_PARAMETER name:<this> type:<root>.A
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public final fun <get-x> (): <root>.X declared in <root>.A'
+            GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:<root>.X visibility:private' type=<root>.X origin=null
+              receiver: GET_VAR '<this>: <root>.A declared in <root>.A.<get-x>' type=<root>.A origin=null
+      FUN DEFAULT_PROPERTY_ACCESSOR name:<set-x> visibility:private modality:FINAL <> ($this:<root>.A, <set-?>:<root>.X) returnType:kotlin.Unit
+        correspondingProperty: PROPERTY name:x visibility:public modality:FINAL [lateinit,var]
+        $this: VALUE_PARAMETER name:<this> type:<root>.A
+        VALUE_PARAMETER name:<set-?> index:0 type:<root>.X
+        BLOCK_BODY
+          SET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:<root>.X visibility:private' type=kotlin.Unit origin=null
+            receiver: GET_VAR '<this>: <root>.A declared in <root>.A.<set-x>' type=<root>.A origin=null
+            value: GET_VAR '<set-?>: <root>.X declared in <root>.A.<set-x>' type=<root>.X origin=null
+    PROPERTY name:y visibility:public modality:FINAL [var]
+      FIELD PROPERTY_BACKING_FIELD name:y type:<root>.X visibility:private
+        EXPRESSION_BODY
+          CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.X' type=<root>.X origin=null
+      FUN DEFAULT_PROPERTY_ACCESSOR name:<get-y> visibility:public modality:FINAL <> ($this:<root>.A) returnType:<root>.X
+        correspondingProperty: PROPERTY name:y visibility:public modality:FINAL [var]
+        $this: VALUE_PARAMETER name:<this> type:<root>.A
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public final fun <get-y> (): <root>.X declared in <root>.A'
+            GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:y type:<root>.X visibility:private' type=<root>.X origin=null
+              receiver: GET_VAR '<this>: <root>.A declared in <root>.A.<get-y>' type=<root>.A origin=null
+      FUN DEFAULT_PROPERTY_ACCESSOR name:<set-y> visibility:private modality:FINAL <> ($this:<root>.A, <set-?>:<root>.X) returnType:kotlin.Unit
+        correspondingProperty: PROPERTY name:y visibility:public modality:FINAL [var]
+        $this: VALUE_PARAMETER name:<this> type:<root>.A
+        VALUE_PARAMETER name:<set-?> index:0 type:<root>.X
+        BLOCK_BODY
+          SET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:y type:<root>.X visibility:private' type=kotlin.Unit origin=null
+            receiver: GET_VAR '<this>: <root>.A declared in <root>.A.<set-y>' type=<root>.A origin=null
+            value: GET_VAR '<set-?>: <root>.X declared in <root>.A.<set-y>' type=<root>.X origin=null
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  CLASS CLASS name:B modality:FINAL visibility:public superTypes:[<root>.A]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.B
+    CONSTRUCTOR visibility:public <> () returnType:<root>.B [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.A'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:B modality:FINAL visibility:public superTypes:[<root>.A]'
+    PROPERTY FAKE_OVERRIDE name:x visibility:public modality:FINAL [lateinit,fake_override,var]
+      overridden:
+        public final x: <root>.X [lateinit,var]
+      FUN FAKE_OVERRIDE name:<get-x> visibility:public modality:FINAL <> ($this:<root>.A) returnType:<root>.X [fake_override]
+        correspondingProperty: PROPERTY FAKE_OVERRIDE name:x visibility:public modality:FINAL [lateinit,fake_override,var]
+        overridden:
+          public final fun <get-x> (): <root>.X declared in <root>.A
+        $this: VALUE_PARAMETER name:<this> type:<root>.A
+    PROPERTY FAKE_OVERRIDE name:y visibility:public modality:FINAL [fake_override,var]
+      overridden:
+        public final y: <root>.X [var]
+      FUN FAKE_OVERRIDE name:<get-y> visibility:public modality:FINAL <> ($this:<root>.A) returnType:<root>.X [fake_override]
+        correspondingProperty: PROPERTY FAKE_OVERRIDE name:y visibility:public modality:FINAL [fake_override,var]
+        overridden:
+          public final fun <get-y> (): <root>.X declared in <root>.A
+        $this: VALUE_PARAMETER name:<this> type:<root>.A
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean [fake_override,operator] declared in <root>.A
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int [fake_override] declared in <root>.A
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String [fake_override] declared in <root>.A
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  FUN name:test visibility:public modality:FINAL <> (b:<root>.B) returnType:kotlin.Unit
+    VALUE_PARAMETER name:b index:0 type:<root>.B
+    BLOCK_BODY
+      CALL 'public final fun plusAssign (data: kotlin.String): kotlin.Unit [operator] declared in <root>.X' type=kotlin.Unit origin=null
+        $this: CALL 'public final fun <get-x> (): <root>.X declared in <root>.A' type=<root>.X origin=GET_PROPERTY
+          $this: GET_VAR 'b: <root>.B declared in <root>.test' type=<root>.B origin=null
+        data: CONST String type=kotlin.String value="x"
+      CALL 'public final fun plusAssign (data: kotlin.String): kotlin.Unit [operator] declared in <root>.X' type=kotlin.Unit origin=null
+        $this: CALL 'public final fun <get-y> (): <root>.X declared in <root>.A' type=<root>.X origin=GET_PROPERTY
+          $this: GET_VAR 'b: <root>.B declared in <root>.test' type=<root>.B origin=null
+        data: CONST String type=kotlin.String value="y"
diff --git a/compiler/testData/ir/irText/expressions/kt49203.ir.txt b/compiler/testData/ir/irText/expressions/kt49203.ir.txt
new file mode 100644
index 00000000000..1de17cee30d
--- /dev/null
+++ b/compiler/testData/ir/irText/expressions/kt49203.ir.txt
@@ -0,0 +1,159 @@
+FILE fqName:<root> fileName:/kt49203.kt
+  CLASS CLASS name:X modality:FINAL visibility:public superTypes:[kotlin.Any]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.X
+    CONSTRUCTOR visibility:public <> () returnType:<root>.X [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:X modality:FINAL visibility:public superTypes:[kotlin.Any]'
+    PROPERTY name:value visibility:public modality:FINAL [var]
+      FIELD PROPERTY_BACKING_FIELD name:value type:kotlin.String visibility:private
+        EXPRESSION_BODY
+          CONST String type=kotlin.String value=""
+      FUN DEFAULT_PROPERTY_ACCESSOR name:<get-value> visibility:public modality:FINAL <> ($this:<root>.X) returnType:kotlin.String
+        correspondingProperty: PROPERTY name:value visibility:public modality:FINAL [var]
+        $this: VALUE_PARAMETER name:<this> type:<root>.X
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public final fun <get-value> (): kotlin.String declared in <root>.X'
+            GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:value type:kotlin.String visibility:private' type=kotlin.String origin=null
+              receiver: GET_VAR '<this>: <root>.X declared in <root>.X.<get-value>' type=<root>.X origin=null
+      FUN DEFAULT_PROPERTY_ACCESSOR name:<set-value> visibility:public modality:FINAL <> ($this:<root>.X, <set-?>:kotlin.String) returnType:kotlin.Unit
+        correspondingProperty: PROPERTY name:value visibility:public modality:FINAL [var]
+        $this: VALUE_PARAMETER name:<this> type:<root>.X
+        VALUE_PARAMETER name:<set-?> index:0 type:kotlin.String
+        BLOCK_BODY
+          SET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:value type:kotlin.String visibility:private' type=kotlin.Unit origin=null
+            receiver: GET_VAR '<this>: <root>.X declared in <root>.X.<set-value>' type=<root>.X origin=null
+            value: GET_VAR '<set-?>: kotlin.String declared in <root>.X.<set-value>' type=kotlin.String origin=null
+    FUN name:plusAssign visibility:public modality:FINAL <> ($this:<root>.X, data:kotlin.String) returnType:kotlin.Unit [operator]
+      $this: VALUE_PARAMETER name:<this> type:<root>.X
+      VALUE_PARAMETER name:data index:0 type:kotlin.String
+      BLOCK_BODY
+        BLOCK type=kotlin.Unit origin=PLUSEQ
+          VAR IR_TEMPORARY_VARIABLE name:tmp_0 type:<root>.X [val]
+            GET_VAR '<this>: <root>.X declared in <root>.X.plusAssign' type=<root>.X origin=null
+          CALL 'public final fun <set-value> (<set-?>: kotlin.String): kotlin.Unit declared in <root>.X' type=kotlin.Unit origin=PLUSEQ
+            $this: GET_VAR 'val tmp_0: <root>.X [val] declared in <root>.X.plusAssign' type=<root>.X origin=null
+            <set-?>: CALL 'public final fun plus (other: kotlin.Any?): kotlin.String [operator] declared in kotlin.String' type=kotlin.String origin=PLUSEQ
+              $this: CALL 'public final fun <get-value> (): kotlin.String declared in <root>.X' type=kotlin.String origin=PLUSEQ
+                $this: GET_VAR 'val tmp_0: <root>.X [val] declared in <root>.X.plusAssign' type=<root>.X origin=null
+              other: GET_VAR 'data: kotlin.String declared in <root>.X.plusAssign' type=kotlin.String origin=null
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  CLASS CLASS name:A modality:ABSTRACT visibility:public superTypes:[kotlin.Any]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.A
+    CONSTRUCTOR visibility:public <> () returnType:<root>.A [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:A modality:ABSTRACT visibility:public superTypes:[kotlin.Any]'
+    PROPERTY name:x visibility:public modality:FINAL [lateinit,var]
+      FIELD PROPERTY_BACKING_FIELD name:x type:<root>.X visibility:private
+      FUN DEFAULT_PROPERTY_ACCESSOR name:<get-x> visibility:public modality:FINAL <> ($this:<root>.A) returnType:<root>.X
+        correspondingProperty: PROPERTY name:x visibility:public modality:FINAL [lateinit,var]
+        $this: VALUE_PARAMETER name:<this> type:<root>.A
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public final fun <get-x> (): <root>.X declared in <root>.A'
+            GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:<root>.X visibility:private' type=<root>.X origin=null
+              receiver: GET_VAR '<this>: <root>.A declared in <root>.A.<get-x>' type=<root>.A origin=null
+      FUN DEFAULT_PROPERTY_ACCESSOR name:<set-x> visibility:private modality:FINAL <> ($this:<root>.A, <set-?>:<root>.X) returnType:kotlin.Unit
+        correspondingProperty: PROPERTY name:x visibility:public modality:FINAL [lateinit,var]
+        $this: VALUE_PARAMETER name:<this> type:<root>.A
+        VALUE_PARAMETER name:<set-?> index:0 type:<root>.X
+        BLOCK_BODY
+          SET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:x type:<root>.X visibility:private' type=kotlin.Unit origin=null
+            receiver: GET_VAR '<this>: <root>.A declared in <root>.A.<set-x>' type=<root>.A origin=null
+            value: GET_VAR '<set-?>: <root>.X declared in <root>.A.<set-x>' type=<root>.X origin=null
+    PROPERTY name:y visibility:public modality:FINAL [var]
+      FIELD PROPERTY_BACKING_FIELD name:y type:<root>.X visibility:private
+        EXPRESSION_BODY
+          CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.X' type=<root>.X origin=null
+      FUN DEFAULT_PROPERTY_ACCESSOR name:<get-y> visibility:public modality:FINAL <> ($this:<root>.A) returnType:<root>.X
+        correspondingProperty: PROPERTY name:y visibility:public modality:FINAL [var]
+        $this: VALUE_PARAMETER name:<this> type:<root>.A
+        BLOCK_BODY
+          RETURN type=kotlin.Nothing from='public final fun <get-y> (): <root>.X declared in <root>.A'
+            GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:y type:<root>.X visibility:private' type=<root>.X origin=null
+              receiver: GET_VAR '<this>: <root>.A declared in <root>.A.<get-y>' type=<root>.A origin=null
+      FUN DEFAULT_PROPERTY_ACCESSOR name:<set-y> visibility:private modality:FINAL <> ($this:<root>.A, <set-?>:<root>.X) returnType:kotlin.Unit
+        correspondingProperty: PROPERTY name:y visibility:public modality:FINAL [var]
+        $this: VALUE_PARAMETER name:<this> type:<root>.A
+        VALUE_PARAMETER name:<set-?> index:0 type:<root>.X
+        BLOCK_BODY
+          SET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:y type:<root>.X visibility:private' type=kotlin.Unit origin=null
+            receiver: GET_VAR '<this>: <root>.A declared in <root>.A.<set-y>' type=<root>.A origin=null
+            value: GET_VAR '<set-?>: <root>.X declared in <root>.A.<set-y>' type=<root>.X origin=null
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String declared in kotlin.Any
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  CLASS CLASS name:B modality:FINAL visibility:public superTypes:[<root>.A]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.B
+    CONSTRUCTOR visibility:public <> () returnType:<root>.B [primary]
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in <root>.A'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:B modality:FINAL visibility:public superTypes:[<root>.A]'
+    PROPERTY FAKE_OVERRIDE name:x visibility:public modality:FINAL [lateinit,fake_override,var]
+      overridden:
+        public final x: <root>.X [lateinit,var]
+      FUN FAKE_OVERRIDE name:<get-x> visibility:public modality:FINAL <> ($this:<root>.A) returnType:<root>.X [fake_override]
+        correspondingProperty: PROPERTY FAKE_OVERRIDE name:x visibility:public modality:FINAL [lateinit,fake_override,var]
+        overridden:
+          public final fun <get-x> (): <root>.X declared in <root>.A
+        $this: VALUE_PARAMETER name:<this> type:<root>.A
+    PROPERTY FAKE_OVERRIDE name:y visibility:public modality:FINAL [fake_override,var]
+      overridden:
+        public final y: <root>.X [var]
+      FUN FAKE_OVERRIDE name:<get-y> visibility:public modality:FINAL <> ($this:<root>.A) returnType:<root>.X [fake_override]
+        correspondingProperty: PROPERTY FAKE_OVERRIDE name:y visibility:public modality:FINAL [fake_override,var]
+        overridden:
+          public final fun <get-y> (): <root>.X declared in <root>.A
+        $this: VALUE_PARAMETER name:<this> type:<root>.A
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean [fake_override,operator] declared in <root>.A
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int [fake_override] declared in <root>.A
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String [fake_override] declared in <root>.A
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  FUN name:test visibility:public modality:FINAL <> (b:<root>.B) returnType:kotlin.Unit
+    VALUE_PARAMETER name:b index:0 type:<root>.B
+    BLOCK_BODY
+      BLOCK type=kotlin.Unit origin=PLUSEQ
+        VAR IR_TEMPORARY_VARIABLE name:tmp_1 type:<root>.B [val]
+          GET_VAR 'b: <root>.B declared in <root>.test' type=<root>.B origin=null
+        CALL 'public final fun plusAssign (data: kotlin.String): kotlin.Unit [operator] declared in <root>.X' type=kotlin.Unit origin=PLUSEQ
+          $this: CALL 'public final fun <get-x> (): <root>.X [fake_override] declared in <root>.B' type=<root>.X origin=PLUSEQ
+            $this: GET_VAR 'val tmp_1: <root>.B [val] declared in <root>.test' type=<root>.B origin=null
+          data: CONST String type=kotlin.String value="x"
+      BLOCK type=kotlin.Unit origin=PLUSEQ
+        VAR IR_TEMPORARY_VARIABLE name:tmp_2 type:<root>.B [val]
+          GET_VAR 'b: <root>.B declared in <root>.test' type=<root>.B origin=null
+        CALL 'public final fun plusAssign (data: kotlin.String): kotlin.Unit [operator] declared in <root>.X' type=kotlin.Unit origin=PLUSEQ
+          $this: CALL 'public final fun <get-y> (): <root>.X [fake_override] declared in <root>.B' type=<root>.X origin=PLUSEQ
+            $this: GET_VAR 'val tmp_2: <root>.B [val] declared in <root>.test' type=<root>.B origin=null
+          data: CONST String type=kotlin.String value="y"
diff --git a/compiler/testData/ir/irText/expressions/kt49203.kt b/compiler/testData/ir/irText/expressions/kt49203.kt
new file mode 100644
index 00000000000..00c8bf3a636
--- /dev/null
+++ b/compiler/testData/ir/irText/expressions/kt49203.kt
@@ -0,0 +1,23 @@
+// SKIP_KT_DUMP
+
+class X {
+    var value = ""
+
+    operator fun plusAssign(data: String) {
+        value += data
+    }
+}
+
+abstract class A {
+    lateinit var x: X
+        private set
+
+    var y: X = X(); private set
+}
+
+class B : A()
+
+fun test(b: B) {
+    b.x += "x"
+    b.y += "y"
+}
\ No newline at end of file
diff --git a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java
index eb254cfab06..ff43aebfa88 100644
--- a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java
+++ b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java
@@ -29998,6 +29998,18 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             runTest("compiler/testData/codegen/box/properties/kt4383.kt");
         }
 
+        @Test
+        @TestMetadata("kt49203_lateinit.kt")
+        public void testKt49203_lateinit() throws Exception {
+            runTest("compiler/testData/codegen/box/properties/kt49203_lateinit.kt");
+        }
+
+        @Test
+        @TestMetadata("kt49203_var.kt")
+        public void testKt49203_var() throws Exception {
+            runTest("compiler/testData/codegen/box/properties/kt49203_var.kt");
+        }
+
         @Test
         @TestMetadata("kt613.kt")
         public void testKt613() throws Exception {
diff --git a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java
index d30d2305317..20d5aa2854c 100644
--- a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java
+++ b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java
@@ -30136,6 +30136,18 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             runTest("compiler/testData/codegen/box/properties/kt4383.kt");
         }
 
+        @Test
+        @TestMetadata("kt49203_lateinit.kt")
+        public void testKt49203_lateinit() throws Exception {
+            runTest("compiler/testData/codegen/box/properties/kt49203_lateinit.kt");
+        }
+
+        @Test
+        @TestMetadata("kt49203_var.kt")
+        public void testKt49203_var() throws Exception {
+            runTest("compiler/testData/codegen/box/properties/kt49203_var.kt");
+        }
+
         @Test
         @TestMetadata("kt613.kt")
         public void testKt613() throws Exception {
diff --git a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/ir/IrTextTestGenerated.java b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/ir/IrTextTestGenerated.java
index f2d2f96b6df..8a522e43cc8 100644
--- a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/ir/IrTextTestGenerated.java
+++ b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/ir/IrTextTestGenerated.java
@@ -1466,6 +1466,12 @@ public class IrTextTestGenerated extends AbstractIrTextTest {
             runTest("compiler/testData/ir/irText/expressions/kt48806.kt");
         }
 
+        @Test
+        @TestMetadata("kt49203.kt")
+        public void testKt49203() throws Exception {
+            runTest("compiler/testData/ir/irText/expressions/kt49203.kt");
+        }
+
         @Test
         @TestMetadata("lambdaInCAO.kt")
         public void testLambdaInCAO() throws Exception {
diff --git a/compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java b/compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java
index faf58634c0e..fe45341986d 100644
--- a/compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java
+++ b/compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java
@@ -25501,6 +25501,16 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             runTest("compiler/testData/codegen/box/properties/kt4383.kt");
         }
 
+        @TestMetadata("kt49203_lateinit.kt")
+        public void testKt49203_lateinit() throws Exception {
+            runTest("compiler/testData/codegen/box/properties/kt49203_lateinit.kt");
+        }
+
+        @TestMetadata("kt49203_var.kt")
+        public void testKt49203_var() throws Exception {
+            runTest("compiler/testData/codegen/box/properties/kt49203_var.kt");
+        }
+
         @TestMetadata("kt613.kt")
         public void testKt613() throws Exception {
             runTest("compiler/testData/codegen/box/properties/kt613.kt");
diff --git a/compiler/tests-gen/org/jetbrains/kotlin/ir/KlibTextTestCaseGenerated.java b/compiler/tests-gen/org/jetbrains/kotlin/ir/KlibTextTestCaseGenerated.java
index d092cb3b5de..636067c3b22 100644
--- a/compiler/tests-gen/org/jetbrains/kotlin/ir/KlibTextTestCaseGenerated.java
+++ b/compiler/tests-gen/org/jetbrains/kotlin/ir/KlibTextTestCaseGenerated.java
@@ -1138,6 +1138,11 @@ public class KlibTextTestCaseGenerated extends AbstractKlibTextTestCase {
             runTest("compiler/testData/ir/irText/expressions/kt48806.kt");
         }
 
+        @TestMetadata("kt49203.kt")
+        public void testKt49203() throws Exception {
+            runTest("compiler/testData/ir/irText/expressions/kt49203.kt");
+        }
+
         @TestMetadata("lambdaInCAO.kt")
         public void testLambdaInCAO() throws Exception {
             runTest("compiler/testData/ir/irText/expressions/lambdaInCAO.kt");
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrJsCodegenBoxES6TestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrJsCodegenBoxES6TestGenerated.java
index 4db5c4ba63c..f4d6c654df8 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrJsCodegenBoxES6TestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrJsCodegenBoxES6TestGenerated.java
@@ -20110,6 +20110,16 @@ public class IrJsCodegenBoxES6TestGenerated extends AbstractIrJsCodegenBoxES6Tes
             runTest("compiler/testData/codegen/box/properties/kt4383.kt");
         }
 
+        @TestMetadata("kt49203_lateinit.kt")
+        public void testKt49203_lateinit() throws Exception {
+            runTest("compiler/testData/codegen/box/properties/kt49203_lateinit.kt");
+        }
+
+        @TestMetadata("kt49203_var.kt")
+        public void testKt49203_var() throws Exception {
+            runTest("compiler/testData/codegen/box/properties/kt49203_var.kt");
+        }
+
         @TestMetadata("kt613.kt")
         public void testKt613() throws Exception {
             runTest("compiler/testData/codegen/box/properties/kt613.kt");
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrJsCodegenBoxTestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrJsCodegenBoxTestGenerated.java
index 77f863c2fc0..6949d954c37 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrJsCodegenBoxTestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrJsCodegenBoxTestGenerated.java
@@ -19516,6 +19516,16 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/properties/kt4383.kt");
         }
 
+        @TestMetadata("kt49203_lateinit.kt")
+        public void testKt49203_lateinit() throws Exception {
+            runTest("compiler/testData/codegen/box/properties/kt49203_lateinit.kt");
+        }
+
+        @TestMetadata("kt49203_var.kt")
+        public void testKt49203_var() throws Exception {
+            runTest("compiler/testData/codegen/box/properties/kt49203_var.kt");
+        }
+
         @TestMetadata("kt613.kt")
         public void testKt613() throws Exception {
             runTest("compiler/testData/codegen/box/properties/kt613.kt");
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java
index 7f69511507f..74ee84ccd3a 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java
@@ -19531,6 +19531,16 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/properties/kt4383.kt");
         }
 
+        @TestMetadata("kt49203_lateinit.kt")
+        public void testKt49203_lateinit() throws Exception {
+            runTest("compiler/testData/codegen/box/properties/kt49203_lateinit.kt");
+        }
+
+        @TestMetadata("kt49203_var.kt")
+        public void testKt49203_var() throws Exception {
+            runTest("compiler/testData/codegen/box/properties/kt49203_var.kt");
+        }
+
         @TestMetadata("kt613.kt")
         public void testKt613() throws Exception {
             runTest("compiler/testData/codegen/box/properties/kt613.kt");
diff --git a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/wasm/semantics/IrCodegenBoxWasmTestGenerated.java b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/wasm/semantics/IrCodegenBoxWasmTestGenerated.java
index 2ad4d711c13..ae69f645588 100644
--- a/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/wasm/semantics/IrCodegenBoxWasmTestGenerated.java
+++ b/js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/wasm/semantics/IrCodegenBoxWasmTestGenerated.java
@@ -18671,6 +18671,16 @@ public class IrCodegenBoxWasmTestGenerated extends AbstractIrCodegenBoxWasmTest
             runTest("compiler/testData/codegen/box/properties/kt4383.kt");
         }
 
+        @TestMetadata("kt49203_lateinit.kt")
+        public void testKt49203_lateinit() throws Exception {
+            runTest("compiler/testData/codegen/box/properties/kt49203_lateinit.kt");
+        }
+
+        @TestMetadata("kt49203_var.kt")
+        public void testKt49203_var() throws Exception {
+            runTest("compiler/testData/codegen/box/properties/kt49203_var.kt");
+        }
+
         @TestMetadata("kt613.kt")
         public void testKt613() throws Exception {
             runTest("compiler/testData/codegen/box/properties/kt613.kt");