diff --git a/java/java-tests/testData/ipp/com/siyeh/ipp/interfaceToClass/InheritorWarnings.java b/java/java-tests/testData/ipp/com/siyeh/ipp/interfaceToClass/InheritorWarnings.java
new file mode 100644
index 000000000000..f7304fe0e375
--- /dev/null
+++ b/java/java-tests/testData/ipp/com/siyeh/ipp/interfaceToClass/InheritorWarnings.java
@@ -0,0 +1,24 @@
+interface Probable {}
+interface Something<caret> extends Probable {
+  void run();
+}
+class AX {
+  void x() {
+    Something s = () -> {};
+  }
+}
+interface SomethingSub extends Something {}
+record SomethingElse() implements Something {
+  @Override
+  public void run() {
+
+  }
+}
+enum SomethingEnum implements Something {
+  ;
+
+  @Override
+  public void run() {
+
+  }
+}
\ No newline at end of file
diff --git a/java/java-tests/testData/ipp/com/siyeh/ipp/interfaceToClass/InheritorWarnings_after.java b/java/java-tests/testData/ipp/com/siyeh/ipp/interfaceToClass/InheritorWarnings_after.java
new file mode 100644
index 000000000000..50592982583b
--- /dev/null
+++ b/java/java-tests/testData/ipp/com/siyeh/ipp/interfaceToClass/InheritorWarnings_after.java
@@ -0,0 +1,24 @@
+interface Probable {}
+abstract static class Something implements Probable {
+  public abstract void run();
+}
+class AX {
+  void x() {
+    Something s = () -> {};
+  }
+}
+interface SomethingSub extends Something {}
+record SomethingElse() implements Something {
+  @Override
+  public void run() {
+
+  }
+}
+enum SomethingEnum extends Something {
+  ;
+
+  @Override
+  public void run() {
+
+  }
+}
\ No newline at end of file
diff --git a/java/java-tests/testSrc/com/siyeh/ipp/interfacetoclass/ConvertInterfaceToClassTest.java b/java/java-tests/testSrc/com/siyeh/ipp/interfacetoclass/ConvertInterfaceToClassTest.java
index 06dfd82f3b84..653eed4ed1d6 100644
--- a/java/java-tests/testSrc/com/siyeh/ipp/interfacetoclass/ConvertInterfaceToClassTest.java
+++ b/java/java-tests/testSrc/com/siyeh/ipp/interfacetoclass/ConvertInterfaceToClassTest.java
@@ -8,7 +8,7 @@ import com.siyeh.IntentionPowerPackBundle;
 import com.siyeh.ipp.IPPTestCase;
 import org.jetbrains.annotations.NotNull;
 
-import java.util.List;
+import java.util.Set;
 
 public class ConvertInterfaceToClassTest extends IPPTestCase {
   public void testBasic() { doTest(); }
@@ -20,17 +20,27 @@ public class ConvertInterfaceToClassTest extends IPPTestCase {
 
   public void testFunctionalExpressions() {
     UiInterceptors.register(new ConflictInterceptor(
-      List.of("() -> {...} in Test will not compile after converting interface <b><code>FunctionalExpressions</code></b> to a class")));
+      Set.of("() -> {...} in Test will not compile after converting interface <b><code>FunctionalExpressions</code></b> to a class")));
     doTest();
   }
 
   public void testExtendsConflict() {
     UiInterceptors.register(new ConflictInterceptor(
-      List.of("class <b><code>AaaImpl</code></b> implementing interface <b><code>Aaa</code></b> already extends class " +
+      Set.of("class <b><code>AaaImpl</code></b> implementing interface <b><code>Aaa</code></b> already extends class " +
               "<b><code>Bbb</code></b> and will not compile after converting interface <b><code>Aaa</code></b> to a class")));
     doTest();
   }
 
+  public void testInheritorWarnings() {
+    UiInterceptors.register(new ConflictInterceptor(
+      Set.of(
+        "() -> {...} in x() in InheritorWarnings.AX will not compile after converting interface <b><code>InheritorWarnings.Something</code></b> to a class",
+        "enum <b><code>InheritorWarnings.SomethingEnum</code></b> implementing interface <b><code>InheritorWarnings.Something</code></b> will not compile after converting interface <b><code>InheritorWarnings.Something</code></b> to a class",
+        "interface <b><code>InheritorWarnings.SomethingSub</code></b> implementing interface <b><code>InheritorWarnings.Something</code></b> will not compile after converting interface <b><code>InheritorWarnings.Something</code></b> to a class"
+      )));
+    doTest();
+  }
+
   public void testFunctionalInterface() {
     assertIntentionNotAvailable();
   }
diff --git a/platform/lang-impl/src/com/intellij/refactoring/ui/ConflictsDialog.java b/platform/lang-impl/src/com/intellij/refactoring/ui/ConflictsDialog.java
index f796c70c355c..c9a203124beb 100644
--- a/platform/lang-impl/src/com/intellij/refactoring/ui/ConflictsDialog.java
+++ b/platform/lang-impl/src/com/intellij/refactoring/ui/ConflictsDialog.java
@@ -1,5 +1,4 @@
 // Copyright 2000-2023 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
-
 package com.intellij.refactoring.ui;
 
 import com.intellij.codeInsight.highlighting.ReadWriteAccessDetector;
@@ -33,7 +32,7 @@ import java.awt.*;
 import java.awt.event.ActionEvent;
 import java.util.ArrayList;
 import java.util.LinkedHashSet;
-import java.util.List;
+import java.util.Set;
 import java.util.regex.Pattern;
 
 public class ConflictsDialog extends DialogWrapper implements ConflictsDialogBase {
@@ -91,8 +90,8 @@ public class ConflictsDialog extends DialogWrapper implements ConflictsDialogBas
     init();
   }
 
-  public List<String> getConflictDescriptions() {
-    return List.of(myConflictDescriptions);
+  public Set<String> getConflictDescriptions() {
+    return Set.of(myConflictDescriptions);
   }
 
   @Override
diff --git a/platform/testFramework/src/com/intellij/ui/ConflictInterceptor.java b/platform/testFramework/src/com/intellij/ui/ConflictInterceptor.java
index f213fbb50287..e9559511cfab 100644
--- a/platform/testFramework/src/com/intellij/ui/ConflictInterceptor.java
+++ b/platform/testFramework/src/com/intellij/ui/ConflictInterceptor.java
@@ -4,7 +4,7 @@ package com.intellij.ui;
 import com.intellij.refactoring.ui.ConflictsDialog;
 import org.jetbrains.annotations.NotNull;
 
-import java.util.List;
+import java.util.Set;
 
 import static org.junit.Assert.assertEquals;
 
@@ -12,12 +12,12 @@ import static org.junit.Assert.assertEquals;
  * An interceptor that expects a conflict dialog. An interceptor assumes that "Continue" button will be pressed
  */
 public class ConflictInterceptor extends UiInterceptors.UiInterceptor<ConflictsDialog> {
-  private final List<String> myConflicts;
+  private final Set<String> myConflicts;
 
   /**
    * @param expectedConflicts list of expected conflicts
    */
-  public ConflictInterceptor(List<String> expectedConflicts) {
+  public ConflictInterceptor(Set<String> expectedConflicts) {
     super(ConflictsDialog.class);
     myConflicts = expectedConflicts;
   }