diff --git a/compiler/testData/diagnostics/tests/syntheticSet.fir.kt b/compiler/testData/diagnostics/tests/syntheticSet.fir.kt
index 73ceef2c0b8..29a16afb52f 100644
--- a/compiler/testData/diagnostics/tests/syntheticSet.fir.kt
+++ b/compiler/testData/diagnostics/tests/syntheticSet.fir.kt
@@ -9,6 +9,12 @@ public class Container<E> {
     }
 
     public void setWrapper(Wrapper<E> wrapper) {}
+
+    public E getSimple() {
+        return null;
+    }
+
+    public void setSimple(E e) {}
 }
 
 // FILE: Wrapper.java
@@ -22,19 +28,28 @@ fun foo(container: Container<*>, wrapper: Wrapper<String>) {
     container.w = <!ASSIGNMENT_TYPE_MISMATCH!>wrapper<!>
     container.wrapper = <!ASSIGNMENT_TYPE_MISMATCH!>wrapper<!>
     container.setWrapper(<!ARGUMENT_TYPE_MISMATCH!>wrapper<!>)
+
+    container.simple = <!ASSIGNMENT_TYPE_MISMATCH!>"123"<!>
+    container.setSimple(<!ARGUMENT_TYPE_MISMATCH!>"123"<!>)
 }
 
 fun bar(container: Container<String>, wrapper: Wrapper<String>) {
     container.wrapper = wrapper
     container.setWrapper(wrapper)
+
+    container.simple = "123"
+    container.setSimple("123")
 }
 
 fun baz(container: Container<Any>, wrapper: Wrapper<String>) {
     container.wrapper = <!ASSIGNMENT_TYPE_MISMATCH!>wrapper<!>
+    container.simple = "123"
+    container.setSimple("123")
 }
 
 fun gau(container: Container<String>, wrapper: Wrapper<Any>) {
     container.wrapper = <!ASSIGNMENT_TYPE_MISMATCH!>wrapper<!>
+    container.simple = <!ASSIGNMENT_TYPE_MISMATCH!>456<!>
 }
 
 fun dif(container: Container<String>, wrapper: Wrapper<Int>) {
@@ -44,14 +59,20 @@ fun dif(container: Container<String>, wrapper: Wrapper<Int>) {
 fun out(container: Container<out Any>, wrapper: Wrapper<String>) {
     container.wrapper = <!ASSIGNMENT_TYPE_MISMATCH!>wrapper<!>
     container.setWrapper(<!ARGUMENT_TYPE_MISMATCH!>wrapper<!>)
+    container.simple = <!ASSIGNMENT_TYPE_MISMATCH!>"123"<!>
+    container.setSimple(<!ARGUMENT_TYPE_MISMATCH!>"123"<!>)
 }
 
 fun inn(container: Container<in String>, wrapper: Wrapper<Any>) {
     container.wrapper = <!ASSIGNMENT_TYPE_MISMATCH!>wrapper<!>
     container.setWrapper(<!ARGUMENT_TYPE_MISMATCH!>wrapper<!>)
+    container.simple = <!ASSIGNMENT_TYPE_MISMATCH!>456<!>
+    container.setSimple(<!ARGUMENT_TYPE_MISMATCH!>456<!>)
 }
 
-fun <T> generic(container: Container<out T>, wrapper: Wrapper<out T>) {
+fun <T> generic(container: Container<out T>, wrapper: Wrapper<out T>, arg: T) {
     container.wrapper = <!ASSIGNMENT_TYPE_MISMATCH!>wrapper<!>
     container.setWrapper(<!ARGUMENT_TYPE_MISMATCH!>wrapper<!>)
+    container.simple = <!ASSIGNMENT_TYPE_MISMATCH!>arg<!>
+    container.setSimple(<!ARGUMENT_TYPE_MISMATCH!>arg<!>)
 }
diff --git a/compiler/testData/diagnostics/tests/syntheticSet.kt b/compiler/testData/diagnostics/tests/syntheticSet.kt
index e849419708e..14360d3b2f2 100644
--- a/compiler/testData/diagnostics/tests/syntheticSet.kt
+++ b/compiler/testData/diagnostics/tests/syntheticSet.kt
@@ -9,6 +9,12 @@ public class Container<E> {
     }
 
     public void setWrapper(Wrapper<E> wrapper) {}
+
+    public E getSimple() {
+        return null;
+    }
+
+    public void setSimple(E e) {}
 }
 
 // FILE: Wrapper.java
@@ -22,19 +28,28 @@ fun foo(container: Container<*>, wrapper: Wrapper<String>) {
     container.w = <!TYPE_MISMATCH!>wrapper<!>
     <!SYNTHETIC_SETTER_PROJECTED_OUT!>container.wrapper<!> = wrapper
     container.setWrapper(<!TYPE_MISMATCH!>wrapper<!>)
+
+    container.simple = "123"
+    container.setSimple(<!TYPE_MISMATCH!>"123"<!>)
 }
 
 fun bar(container: Container<String>, wrapper: Wrapper<String>) {
     container.wrapper = wrapper
     container.setWrapper(wrapper)
+
+    container.simple = "123"
+    container.setSimple("123")
 }
 
 fun baz(container: Container<Any>, wrapper: Wrapper<String>) {
     container.wrapper = <!TYPE_MISMATCH!>wrapper<!>
+    container.simple = "123"
+    container.setSimple("123")
 }
 
 fun gau(container: Container<String>, wrapper: Wrapper<Any>) {
     container.wrapper = <!TYPE_MISMATCH!>wrapper<!>
+    container.simple = <!CONSTANT_EXPECTED_TYPE_MISMATCH!>456<!>
 }
 
 fun dif(container: Container<String>, wrapper: Wrapper<Int>) {
@@ -44,14 +59,20 @@ fun dif(container: Container<String>, wrapper: Wrapper<Int>) {
 fun out(container: Container<out Any>, wrapper: Wrapper<String>) {
     <!SYNTHETIC_SETTER_PROJECTED_OUT!>container.wrapper<!> = wrapper
     container.setWrapper(<!TYPE_MISMATCH!>wrapper<!>)
+    container.simple = "123"
+    container.setSimple(<!TYPE_MISMATCH!>"123"<!>)
 }
 
 fun inn(container: Container<in String>, wrapper: Wrapper<Any>) {
     <!SYNTHETIC_SETTER_PROJECTED_OUT!>container.wrapper<!> = wrapper
     container.setWrapper(<!TYPE_MISMATCH!>wrapper<!>)
+    container.simple = 456
+    container.setSimple(<!CONSTANT_EXPECTED_TYPE_MISMATCH!>456<!>)
 }
 
-fun <T> generic(container: Container<out T>, wrapper: Wrapper<out T>) {
+fun <T> generic(container: Container<out T>, wrapper: Wrapper<out T>, arg: T) {
     <!SYNTHETIC_SETTER_PROJECTED_OUT!>container.wrapper<!> = wrapper
     container.setWrapper(<!TYPE_MISMATCH!>wrapper<!>)
+    container.simple = arg
+    container.setSimple(<!TYPE_MISMATCH!>arg<!>)
 }
diff --git a/compiler/testData/diagnostics/tests/syntheticSet.txt b/compiler/testData/diagnostics/tests/syntheticSet.txt
index 6e62b658582..4dc60906c78 100644
--- a/compiler/testData/diagnostics/tests/syntheticSet.txt
+++ b/compiler/testData/diagnostics/tests/syntheticSet.txt
@@ -5,7 +5,7 @@ public fun baz(/*0*/ container: Container<kotlin.Any>, /*1*/ wrapper: Wrapper<ko
 public fun dif(/*0*/ container: Container<kotlin.String>, /*1*/ wrapper: Wrapper<kotlin.Int>): kotlin.Unit
 public fun foo(/*0*/ container: Container<*>, /*1*/ wrapper: Wrapper<kotlin.String>): kotlin.Unit
 public fun gau(/*0*/ container: Container<kotlin.String>, /*1*/ wrapper: Wrapper<kotlin.Any>): kotlin.Unit
-public fun </*0*/ T> generic(/*0*/ container: Container<out T>, /*1*/ wrapper: Wrapper<out T>): kotlin.Unit
+public fun </*0*/ T> generic(/*0*/ container: Container<out T>, /*1*/ wrapper: Wrapper<out T>, /*2*/ arg: T): kotlin.Unit
 public fun inn(/*0*/ container: Container<in kotlin.String>, /*1*/ wrapper: Wrapper<kotlin.Any>): kotlin.Unit
 public fun out(/*0*/ container: Container<out kotlin.Any>, /*1*/ wrapper: Wrapper<kotlin.String>): kotlin.Unit
 
@@ -13,8 +13,10 @@ public open class Container</*0*/ E : kotlin.Any!> {
     public constructor Container</*0*/ E : kotlin.Any!>()
     public/*package*/ final var w: Wrapper<E!>!
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open fun getSimple(): E!
     public open fun getWrapper(): Wrapper<E!>!
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open fun setSimple(/*0*/ e: E!): kotlin.Unit
     public open fun setWrapper(/*0*/ wrapper: Wrapper<E!>!): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }