diff --git a/compiler/testData/ir/irText/firProblems/DelegationAndInheritanceFromJava.fir.txt b/compiler/testData/ir/irText/firProblems/DelegationAndInheritanceFromJava.fir.txt
index 62dfe155ea2..d72caa18324 100644
--- a/compiler/testData/ir/irText/firProblems/DelegationAndInheritanceFromJava.fir.txt
+++ b/compiler/testData/ir/irText/firProblems/DelegationAndInheritanceFromJava.fir.txt
@@ -12,7 +12,6 @@ FILE fqName:<root> fileName:/DelegationAndInheritanceFromJava.kt
     FUN DELEGATED_MEMBER name:add visibility:public modality:OPEN <> ($this:<root>.Impl, element:kotlin.String?) returnType:kotlin.Boolean
       overridden:
         public abstract fun add (element: E of kotlin.collections.MutableSet): kotlin.Boolean declared in kotlin.collections.MutableSet
-        public abstract fun add (element: kotlin.String?): kotlin.Boolean [fake_override] declared in <root>.Foo.B
       $this: VALUE_PARAMETER name:<this> type:<root>.Impl
       VALUE_PARAMETER name:element index:0 type:kotlin.String?
       BLOCK_BODY
@@ -24,7 +23,6 @@ FILE fqName:<root> fileName:/DelegationAndInheritanceFromJava.kt
     FUN DELEGATED_MEMBER name:addAll visibility:public modality:OPEN <> ($this:<root>.Impl, elements:kotlin.collections.Collection<kotlin.String?>) returnType:kotlin.Boolean
       overridden:
         public abstract fun addAll (elements: kotlin.collections.Collection<E of kotlin.collections.MutableSet>): kotlin.Boolean declared in kotlin.collections.MutableSet
-        public abstract fun addAll (elements: kotlin.collections.Collection<kotlin.String?>): kotlin.Boolean [fake_override] declared in <root>.Foo.B
       $this: VALUE_PARAMETER name:<this> type:<root>.Impl
       VALUE_PARAMETER name:elements index:0 type:kotlin.collections.Collection<kotlin.String?>
       BLOCK_BODY
@@ -44,7 +42,6 @@ FILE fqName:<root> fileName:/DelegationAndInheritanceFromJava.kt
     FUN DELEGATED_MEMBER name:iterator visibility:public modality:OPEN <> ($this:<root>.Impl) returnType:kotlin.collections.MutableIterator<kotlin.String?> [operator]
       overridden:
         public abstract fun iterator (): kotlin.collections.MutableIterator<E of kotlin.collections.MutableSet> [operator] declared in kotlin.collections.MutableSet
-        public abstract fun iterator (): kotlin.collections.MutableIterator<kotlin.String?> [fake_override,operator] declared in <root>.Foo.B
       $this: VALUE_PARAMETER name:<this> type:<root>.Impl
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun iterator (): kotlin.collections.MutableIterator<kotlin.String?> [operator] declared in <root>.Impl'
@@ -54,7 +51,6 @@ FILE fqName:<root> fileName:/DelegationAndInheritanceFromJava.kt
     FUN DELEGATED_MEMBER name:remove visibility:public modality:OPEN <> ($this:<root>.Impl, element:kotlin.String?) returnType:kotlin.Boolean
       overridden:
         public abstract fun remove (element: E of kotlin.collections.MutableSet): kotlin.Boolean declared in kotlin.collections.MutableSet
-        public abstract fun remove (element: kotlin.String?): kotlin.Boolean [fake_override] declared in <root>.Foo.B
       $this: VALUE_PARAMETER name:<this> type:<root>.Impl
       VALUE_PARAMETER name:element index:0 type:kotlin.String?
       BLOCK_BODY
@@ -66,7 +62,6 @@ FILE fqName:<root> fileName:/DelegationAndInheritanceFromJava.kt
     FUN DELEGATED_MEMBER name:removeAll visibility:public modality:OPEN <> ($this:<root>.Impl, elements:kotlin.collections.Collection<kotlin.String?>) returnType:kotlin.Boolean
       overridden:
         public abstract fun removeAll (elements: kotlin.collections.Collection<E of kotlin.collections.MutableSet>): kotlin.Boolean declared in kotlin.collections.MutableSet
-        public abstract fun removeAll (elements: kotlin.collections.Collection<kotlin.String?>): kotlin.Boolean [fake_override] declared in <root>.Foo.B
       $this: VALUE_PARAMETER name:<this> type:<root>.Impl
       VALUE_PARAMETER name:elements index:0 type:kotlin.collections.Collection<kotlin.String?>
       BLOCK_BODY
@@ -78,7 +73,6 @@ FILE fqName:<root> fileName:/DelegationAndInheritanceFromJava.kt
     FUN DELEGATED_MEMBER name:retainAll visibility:public modality:OPEN <> ($this:<root>.Impl, elements:kotlin.collections.Collection<kotlin.String?>) returnType:kotlin.Boolean
       overridden:
         public abstract fun retainAll (elements: kotlin.collections.Collection<E of kotlin.collections.MutableSet>): kotlin.Boolean declared in kotlin.collections.MutableSet
-        public abstract fun retainAll (elements: kotlin.collections.Collection<kotlin.String?>): kotlin.Boolean [fake_override] declared in <root>.Foo.B
       $this: VALUE_PARAMETER name:<this> type:<root>.Impl
       VALUE_PARAMETER name:elements index:0 type:kotlin.collections.Collection<kotlin.String?>
       BLOCK_BODY
@@ -90,7 +84,6 @@ FILE fqName:<root> fileName:/DelegationAndInheritanceFromJava.kt
     FUN DELEGATED_MEMBER name:contains visibility:public modality:OPEN <> ($this:<root>.Impl, element:kotlin.String?) returnType:kotlin.Boolean [operator]
       overridden:
         public abstract fun contains (element: E of kotlin.collections.Set): kotlin.Boolean [operator] declared in kotlin.collections.Set
-        public abstract fun contains (element: kotlin.String?): kotlin.Boolean [fake_override,operator] declared in <root>.Foo.B
       $this: VALUE_PARAMETER name:<this> type:<root>.Impl
       VALUE_PARAMETER name:element index:0 type:kotlin.String?
       BLOCK_BODY
@@ -102,7 +95,6 @@ FILE fqName:<root> fileName:/DelegationAndInheritanceFromJava.kt
     FUN DELEGATED_MEMBER name:containsAll visibility:public modality:OPEN <> ($this:<root>.Impl, elements:kotlin.collections.Collection<kotlin.String?>) returnType:kotlin.Boolean
       overridden:
         public abstract fun containsAll (elements: kotlin.collections.Collection<E of kotlin.collections.MutableSet>): kotlin.Boolean [fake_override] declared in kotlin.collections.MutableSet
-        public abstract fun containsAll (elements: kotlin.collections.Collection<kotlin.String?>): kotlin.Boolean [fake_override] declared in <root>.Foo.B
       $this: VALUE_PARAMETER name:<this> type:<root>.Impl
       VALUE_PARAMETER name:elements index:0 type:kotlin.collections.Collection<kotlin.String?>
       BLOCK_BODY
@@ -114,45 +106,12 @@ FILE fqName:<root> fileName:/DelegationAndInheritanceFromJava.kt
     FUN DELEGATED_MEMBER name:isEmpty visibility:public modality:OPEN <> ($this:<root>.Impl) returnType:kotlin.Boolean
       overridden:
         public abstract fun isEmpty (): kotlin.Boolean declared in kotlin.collections.Set
-        public abstract fun isEmpty (): kotlin.Boolean [fake_override] declared in kotlin.collections.MutableSet
       $this: VALUE_PARAMETER name:<this> type:<root>.Impl
       BLOCK_BODY
         RETURN type=kotlin.Nothing from='public open fun isEmpty (): kotlin.Boolean declared in <root>.Impl'
           CALL 'public abstract fun isEmpty (): kotlin.Boolean [fake_override] declared in kotlin.collections.MutableSet' type=kotlin.Boolean origin=null
             $this: GET_FIELD 'FIELD DELEGATE name:<$$delegate_0> type:<root>.Foo.B visibility:local [final]' type=<root>.Foo.B origin=null
               receiver: GET_VAR '<this>: <root>.Impl declared in <root>.Impl.isEmpty' type=<root>.Impl origin=null
-    FUN DELEGATED_MEMBER name:equals visibility:public modality:OPEN <> ($this:<root>.Impl, other:kotlin.Any?) returnType:kotlin.Boolean [operator]
-      overridden:
-        public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in kotlin.Any
-        public open fun equals (other: kotlin.Any?): kotlin.Boolean [fake_override,operator] declared in kotlin.collections.MutableSet
-      $this: VALUE_PARAMETER name:<this> type:<root>.Impl
-      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public open fun equals (other: kotlin.Any?): kotlin.Boolean [operator] declared in <root>.Impl'
-          CALL 'public open fun equals (other: kotlin.Any?): kotlin.Boolean [fake_override,operator] declared in kotlin.collections.MutableSet' type=kotlin.Boolean origin=null
-            $this: GET_FIELD 'FIELD DELEGATE name:<$$delegate_0> type:<root>.Foo.B visibility:local [final]' type=<root>.Foo.B origin=null
-              receiver: GET_VAR '<this>: <root>.Impl declared in <root>.Impl.equals' type=<root>.Impl origin=null
-            other: GET_VAR 'other: kotlin.Any? declared in <root>.Impl.equals' type=kotlin.Any? origin=null
-    FUN DELEGATED_MEMBER name:hashCode visibility:public modality:OPEN <> ($this:<root>.Impl) returnType:kotlin.Int
-      overridden:
-        public open fun hashCode (): kotlin.Int declared in kotlin.Any
-        public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.collections.MutableSet
-      $this: VALUE_PARAMETER name:<this> type:<root>.Impl
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public open fun hashCode (): kotlin.Int declared in <root>.Impl'
-          CALL 'public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.collections.MutableSet' type=kotlin.Int origin=null
-            $this: GET_FIELD 'FIELD DELEGATE name:<$$delegate_0> type:<root>.Foo.B visibility:local [final]' type=<root>.Foo.B origin=null
-              receiver: GET_VAR '<this>: <root>.Impl declared in <root>.Impl.hashCode' type=<root>.Impl origin=null
-    FUN DELEGATED_MEMBER name:toString visibility:public modality:OPEN <> ($this:<root>.Impl) returnType:kotlin.String
-      overridden:
-        public open fun toString (): kotlin.String declared in kotlin.Any
-        public open fun toString (): kotlin.String [fake_override] declared in kotlin.collections.MutableSet
-      $this: VALUE_PARAMETER name:<this> type:<root>.Impl
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in <root>.Impl'
-          CALL 'public open fun toString (): kotlin.String [fake_override] declared in kotlin.collections.MutableSet' type=kotlin.String origin=null
-            $this: GET_FIELD 'FIELD DELEGATE name:<$$delegate_0> type:<root>.Foo.B visibility:local [final]' type=<root>.Foo.B origin=null
-              receiver: GET_VAR '<this>: <root>.Impl declared in <root>.Impl.toString' type=<root>.Impl origin=null
     PROPERTY DELEGATED_MEMBER name:size visibility:public modality:OPEN [val]
       FUN DELEGATED_MEMBER name:<get-size> visibility:public modality:OPEN <> ($this:<root>.Impl) returnType:kotlin.Int
         correspondingProperty: PROPERTY DELEGATED_MEMBER name:size visibility:public modality:OPEN [val]
@@ -161,10 +120,23 @@ FILE fqName:<root> fileName:/DelegationAndInheritanceFromJava.kt
         $this: VALUE_PARAMETER name:<this> type:<root>.Impl
         BLOCK_BODY
           RETURN type=kotlin.Nothing from='public open fun <get-size> (): kotlin.Int declared in <root>.Impl'
-            CALL 'public abstract fun <get-size> (): kotlin.Int declared in kotlin.collections.Set' type=kotlin.Int origin=null
+            CALL 'public abstract fun <get-size> (): kotlin.Int [fake_override] declared in kotlin.collections.MutableSet' type=kotlin.Int origin=null
               $this: GET_FIELD 'FIELD DELEGATE name:<$$delegate_0> type:<root>.Foo.B visibility:local [final]' type=<root>.Foo.B origin=null
                 receiver: GET_VAR '<this>: <root>.Impl declared in <root>.Impl.<get-size>' type=<root>.Impl origin=null
     FIELD DELEGATE name:<$$delegate_0> type:<root>.Foo.B visibility:local [final]
+    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 kotlin.collections.MutableSet
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.collections.MutableSet
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String [fake_override] declared in kotlin.collections.MutableSet
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
   FUN name:box visibility:public modality:FINAL <> () returnType:kotlin.String
     BLOCK_BODY
       RETURN type=kotlin.Nothing from='public final fun box (): kotlin.String declared in <root>'