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 697c25f4c10..309484d4b6b 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
@@ -244,6 +244,12 @@ public class Fir2IrTextTestGenerated extends AbstractFir2IrTextTest {
             runTest("compiler/testData/ir/irText/classes/kt45853.kt");
         }
 
+        @Test
+        @TestMetadata("kt45934.kt")
+        public void testKt45934() throws Exception {
+            runTest("compiler/testData/ir/irText/classes/kt45934.kt");
+        }
+
         @Test
         @TestMetadata("lambdaInDataClassDefaultParameter.kt")
         public void testLambdaInDataClassDefaultParameter() throws Exception {
diff --git a/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/SyntheticDeclarationsGenerator.kt b/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/SyntheticDeclarationsGenerator.kt
index d5541b847d7..3a0de96b15a 100644
--- a/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/SyntheticDeclarationsGenerator.kt
+++ b/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/SyntheticDeclarationsGenerator.kt
@@ -56,7 +56,9 @@ class SyntheticDeclarationsGenerator(context: GeneratorContext) : DeclarationDes
 
     override fun visitFunctionDescriptor(descriptor: FunctionDescriptor, data: IrDeclarationContainer?) {
         require(data != null)
-        if (descriptor.visibility != DescriptorVisibilities.INVISIBLE_FAKE) {
+        if (descriptor.visibility != DescriptorVisibilities.INVISIBLE_FAKE &&
+            descriptor.kind != CallableMemberDescriptor.Kind.DELEGATION // Skip mismatching delegates, see KT-46120
+        ) {
             symbolTable.declareSimpleFunctionIfNotExists(descriptor) {
                 createFunctionStub(descriptor, it).insertDeclaration(data)
             }
diff --git a/compiler/testData/codegen/bytecodeListing/kt45934.kt b/compiler/testData/codegen/bytecodeListing/kt45934.kt
new file mode 100644
index 00000000000..f9496acabb8
--- /dev/null
+++ b/compiler/testData/codegen/bytecodeListing/kt45934.kt
@@ -0,0 +1,22 @@
+// FILE: kt45934.kt
+
+class C(client: J) : I by client
+
+// FILE: I.java
+
+import java.util.List;
+
+public interface I {
+    <C> List<C> foo();
+}
+
+// FILE: J.java
+
+import java.util.List;
+
+public class J implements I {
+    @Override
+    public List<String> foo() {
+        return null;
+    }
+}
diff --git a/compiler/testData/codegen/bytecodeListing/kt45934.txt b/compiler/testData/codegen/bytecodeListing/kt45934.txt
new file mode 100644
index 00000000000..51aaa05486c
--- /dev/null
+++ b/compiler/testData/codegen/bytecodeListing/kt45934.txt
@@ -0,0 +1,6 @@
+@kotlin.Metadata
+public final class C {
+    // source: 'kt45934.kt'
+    private synthetic final field $$delegate_0: J
+    public method <init>(@org.jetbrains.annotations.NotNull p0: J): void
+}
diff --git a/compiler/testData/ir/irText/classes/kt45934.fir.txt b/compiler/testData/ir/irText/classes/kt45934.fir.txt
new file mode 100644
index 00000000000..595be85c87a
--- /dev/null
+++ b/compiler/testData/ir/irText/classes/kt45934.fir.txt
@@ -0,0 +1,35 @@
+FILE fqName:<root> fileName:/kt45934.kt
+  CLASS CLASS name:C modality:FINAL visibility:public superTypes:[<root>.I]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.C
+    CONSTRUCTOR visibility:public <> (client:<root>.J) returnType:<root>.C [primary]
+      VALUE_PARAMETER name:client index:0 type:<root>.J
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:C modality:FINAL visibility:public superTypes:[<root>.I]'
+    FUN DELEGATED_MEMBER name:foo visibility:public modality:OPEN <C> ($this:<root>.C) returnType:@[FlexibleNullability] kotlin.collections.List<@[FlexibleNullability] C of <root>.C.foo?>?
+      overridden:
+        public abstract fun foo <C> (): @[FlexibleNullability] kotlin.collections.List<@[FlexibleNullability] C of <root>.I.foo?>? declared in <root>.I
+      TYPE_PARAMETER name:C index:0 variance: superTypes:[@[FlexibleNullability] kotlin.Any?]
+      $this: VALUE_PARAMETER name:<this> type:<root>.C
+      BLOCK_BODY
+        RETURN type=kotlin.Nothing from='public open fun foo <C> (): @[FlexibleNullability] kotlin.collections.List<@[FlexibleNullability] C of <root>.C.foo?>? declared in <root>.C'
+          CALL 'public abstract fun foo <C> (): @[FlexibleNullability] kotlin.collections.List<@[FlexibleNullability] C of <root>.I.foo?>? declared in <root>.I' type=@[FlexibleNullability] kotlin.collections.List<@[FlexibleNullability] C of <root>.C.foo?>? origin=null
+            <C>: <none>
+            $this: GET_FIELD 'FIELD DELEGATE name:<$$delegate_0> type:<root>.I visibility:local [final]' type=<root>.I origin=null
+              receiver: GET_VAR '<this>: <root>.C declared in <root>.C.foo' type=<root>.C origin=null
+    FIELD DELEGATE name:<$$delegate_0> type:<root>.I visibility:local [final]
+      EXPRESSION_BODY
+        GET_VAR 'client: <root>.J declared in <root>.C.<init>' type=<root>.J 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 [fake_override,operator] declared in <root>.I
+      $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>.I
+      $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>.I
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
diff --git a/compiler/testData/ir/irText/classes/kt45934.kt b/compiler/testData/ir/irText/classes/kt45934.kt
new file mode 100644
index 00000000000..810b27c1202
--- /dev/null
+++ b/compiler/testData/ir/irText/classes/kt45934.kt
@@ -0,0 +1,24 @@
+// SKIP_KT_DUMP
+
+// FILE: kt45934.kt
+
+class C(client: J) : I by client
+
+// FILE: I.java
+
+import java.util.List;
+
+public interface I {
+    <C> List<C> foo();
+}
+
+// FILE: J.java
+
+import java.util.List;
+
+public class J implements I {
+    @Override
+    public List<String> foo() {
+        return null;
+    }
+}
diff --git a/compiler/testData/ir/irText/classes/kt45934.txt b/compiler/testData/ir/irText/classes/kt45934.txt
new file mode 100644
index 00000000000..158048185fa
--- /dev/null
+++ b/compiler/testData/ir/irText/classes/kt45934.txt
@@ -0,0 +1,24 @@
+FILE fqName:<root> fileName:/kt45934.kt
+  CLASS CLASS name:C modality:FINAL visibility:public superTypes:[<root>.I]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.C
+    CONSTRUCTOR visibility:public <> (client:<root>.J) returnType:<root>.C [primary]
+      VALUE_PARAMETER name:client index:0 type:<root>.J
+      BLOCK_BODY
+        DELEGATING_CONSTRUCTOR_CALL 'public constructor <init> () [primary] declared in kotlin.Any'
+        INSTANCE_INITIALIZER_CALL classDescriptor='CLASS CLASS name:C modality:FINAL visibility:public superTypes:[<root>.I]'
+    FIELD DELEGATE name:$$delegate_0 type:<root>.J visibility:private [final]
+      EXPRESSION_BODY
+        GET_VAR 'client: <root>.J declared in <root>.C.<init>' type=<root>.J 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 [fake_override,operator] declared in <root>.I
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int [fake_override] declared in <root>.I
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String [fake_override] declared in <root>.I
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
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 1b5559bbfbf..96f6cec71da 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
@@ -244,6 +244,12 @@ public class IrTextTestGenerated extends AbstractIrTextTest {
             runTest("compiler/testData/ir/irText/classes/kt45853.kt");
         }
 
+        @Test
+        @TestMetadata("kt45934.kt")
+        public void testKt45934() throws Exception {
+            runTest("compiler/testData/ir/irText/classes/kt45934.kt");
+        }
+
         @Test
         @TestMetadata("lambdaInDataClassDefaultParameter.kt")
         public void testLambdaInDataClassDefaultParameter() throws Exception {
diff --git a/compiler/tests-gen/org/jetbrains/kotlin/codegen/BytecodeListingTestGenerated.java b/compiler/tests-gen/org/jetbrains/kotlin/codegen/BytecodeListingTestGenerated.java
index befda0b112d..ee2583a1a7a 100644
--- a/compiler/tests-gen/org/jetbrains/kotlin/codegen/BytecodeListingTestGenerated.java
+++ b/compiler/tests-gen/org/jetbrains/kotlin/codegen/BytecodeListingTestGenerated.java
@@ -180,6 +180,11 @@ public class BytecodeListingTestGenerated extends AbstractBytecodeListingTest {
         runTest("compiler/testData/codegen/bytecodeListing/kt45853a.kt");
     }
 
+    @TestMetadata("kt45934.kt")
+    public void testKt45934() throws Exception {
+        runTest("compiler/testData/codegen/bytecodeListing/kt45934.kt");
+    }
+
     @TestMetadata("localFunction.kt")
     public void testLocalFunction() throws Exception {
         runTest("compiler/testData/codegen/bytecodeListing/localFunction.kt");
diff --git a/compiler/tests-gen/org/jetbrains/kotlin/codegen/ir/IrBytecodeListingTestGenerated.java b/compiler/tests-gen/org/jetbrains/kotlin/codegen/ir/IrBytecodeListingTestGenerated.java
index 511a09af7b1..0498a1c1511 100644
--- a/compiler/tests-gen/org/jetbrains/kotlin/codegen/ir/IrBytecodeListingTestGenerated.java
+++ b/compiler/tests-gen/org/jetbrains/kotlin/codegen/ir/IrBytecodeListingTestGenerated.java
@@ -180,6 +180,11 @@ public class IrBytecodeListingTestGenerated extends AbstractIrBytecodeListingTes
         runTest("compiler/testData/codegen/bytecodeListing/kt45853a.kt");
     }
 
+    @TestMetadata("kt45934.kt")
+    public void testKt45934() throws Exception {
+        runTest("compiler/testData/codegen/bytecodeListing/kt45934.kt");
+    }
+
     @TestMetadata("localFunction.kt")
     public void testLocalFunction() throws Exception {
         runTest("compiler/testData/codegen/bytecodeListing/localFunction.kt");