diff --git a/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosticCompilerTestFE10TestdataTestGenerated.java b/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosticCompilerTestFE10TestdataTestGenerated.java
index 491f662972a..8723651c70a 100644
--- a/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosticCompilerTestFE10TestdataTestGenerated.java
+++ b/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosticCompilerTestFE10TestdataTestGenerated.java
@@ -24684,6 +24684,12 @@ public class DiagnosticCompilerTestFE10TestdataTestGenerated extends AbstractDia
                 runTest("compiler/testData/diagnostics/tests/override/MultipleDefaultsAndNamesInSupertypes.kt");
             }
 
+            @Test
+            @TestMetadata("MultipleDefaultsAndSubstitutionOverrides.kt")
+            public void testMultipleDefaultsAndSubstitutionOverrides() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/override/MultipleDefaultsAndSubstitutionOverrides.kt");
+            }
+
             @Test
             @TestMetadata("MultipleDefaultsInSupertypesNoExplicitOverride.kt")
             public void testMultipleDefaultsInSupertypesNoExplicitOverride() throws Exception {
diff --git a/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated.java b/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated.java
index 00910487b52..fe436dc57fa 100644
--- a/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated.java
+++ b/analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated.java
@@ -24684,6 +24684,12 @@ public class LLFirPreresolvedReversedDiagnosticCompilerFE10TestDataTestGenerated
                 runTest("compiler/testData/diagnostics/tests/override/MultipleDefaultsAndNamesInSupertypes.kt");
             }
 
+            @Test
+            @TestMetadata("MultipleDefaultsAndSubstitutionOverrides.kt")
+            public void testMultipleDefaultsAndSubstitutionOverrides() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/override/MultipleDefaultsAndSubstitutionOverrides.kt");
+            }
+
             @Test
             @TestMetadata("MultipleDefaultsInSupertypesNoExplicitOverride.kt")
             public void testMultipleDefaultsInSupertypesNoExplicitOverride() throws Exception {
diff --git a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirLightTreeOldFrontendDiagnosticsTestGenerated.java b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirLightTreeOldFrontendDiagnosticsTestGenerated.java
index ae4dbd3293d..d78c6f08315 100644
--- a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirLightTreeOldFrontendDiagnosticsTestGenerated.java
+++ b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirLightTreeOldFrontendDiagnosticsTestGenerated.java
@@ -24684,6 +24684,12 @@ public class FirLightTreeOldFrontendDiagnosticsTestGenerated extends AbstractFir
                 runTest("compiler/testData/diagnostics/tests/override/MultipleDefaultsAndNamesInSupertypes.kt");
             }
 
+            @Test
+            @TestMetadata("MultipleDefaultsAndSubstitutionOverrides.kt")
+            public void testMultipleDefaultsAndSubstitutionOverrides() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/override/MultipleDefaultsAndSubstitutionOverrides.kt");
+            }
+
             @Test
             @TestMetadata("MultipleDefaultsInSupertypesNoExplicitOverride.kt")
             public void testMultipleDefaultsInSupertypesNoExplicitOverride() throws Exception {
diff --git a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirPsiOldFrontendDiagnosticsTestGenerated.java b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirPsiOldFrontendDiagnosticsTestGenerated.java
index aeeae06fbf6..06d9dcd69be 100644
--- a/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirPsiOldFrontendDiagnosticsTestGenerated.java
+++ b/compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirPsiOldFrontendDiagnosticsTestGenerated.java
@@ -24690,6 +24690,12 @@ public class FirPsiOldFrontendDiagnosticsTestGenerated extends AbstractFirPsiDia
                 runTest("compiler/testData/diagnostics/tests/override/MultipleDefaultsAndNamesInSupertypes.kt");
             }
 
+            @Test
+            @TestMetadata("MultipleDefaultsAndSubstitutionOverrides.kt")
+            public void testMultipleDefaultsAndSubstitutionOverrides() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/override/MultipleDefaultsAndSubstitutionOverrides.kt");
+            }
+
             @Test
             @TestMetadata("MultipleDefaultsInSupertypesNoExplicitOverride.kt")
             public void testMultipleDefaultsInSupertypesNoExplicitOverride() throws Exception {
diff --git a/compiler/testData/diagnostics/tests/override/MultipleDefaultsAndSubstitutionOverrides.fir.kt b/compiler/testData/diagnostics/tests/override/MultipleDefaultsAndSubstitutionOverrides.fir.kt
new file mode 100644
index 00000000000..69171a53300
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/override/MultipleDefaultsAndSubstitutionOverrides.fir.kt
@@ -0,0 +1,15 @@
+interface A<T> {
+    fun foo(x: Int = 42): Int
+}
+
+open class B<K> {
+    fun foo(x: Int = 239) = x
+}
+
+interface C<E> {
+    fun foo(x: Int): Int
+}
+
+open <!MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES_WHEN_NO_EXPLICIT_OVERRIDE!>class Z<!><R> : A<R>, B<R>(), C<R>
+
+<!MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES_WHEN_NO_EXPLICIT_OVERRIDE_DEPRECATION_WARNING!>class N<!><W> : Z<W>()
diff --git a/compiler/testData/diagnostics/tests/override/MultipleDefaultsAndSubstitutionOverrides.kt b/compiler/testData/diagnostics/tests/override/MultipleDefaultsAndSubstitutionOverrides.kt
new file mode 100644
index 00000000000..4dd2340c5ce
--- /dev/null
+++ b/compiler/testData/diagnostics/tests/override/MultipleDefaultsAndSubstitutionOverrides.kt
@@ -0,0 +1,15 @@
+interface A<T> {
+    fun foo(x: Int = 42): Int
+}
+
+open class B<K> {
+    fun foo(x: Int = 239) = x
+}
+
+interface C<E> {
+    fun foo(x: Int): Int
+}
+
+open <!MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES_WHEN_NO_EXPLICIT_OVERRIDE!>class Z<!><R> : A<R>, B<R>(), C<R>
+
+class N<W> : Z<W>()
diff --git a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
index 89202ee5bf8..75a6a025ec1 100644
--- a/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
+++ b/compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/DiagnosticTestGenerated.java
@@ -26472,6 +26472,12 @@ public class DiagnosticTestGenerated extends AbstractDiagnosticTest {
                 runTest("compiler/testData/diagnostics/tests/override/MultipleDefaultsAndNamesInSupertypes.kt");
             }
 
+            @Test
+            @TestMetadata("MultipleDefaultsAndSubstitutionOverrides.kt")
+            public void testMultipleDefaultsAndSubstitutionOverrides() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/override/MultipleDefaultsAndSubstitutionOverrides.kt");
+            }
+
             @Test
             @TestMetadata("MultipleDefaultsInSupertypesNoExplicitOverride.kt")
             public void testMultipleDefaultsInSupertypesNoExplicitOverride() throws Exception {