diff --git a/packages/PHPStanStaticTypeMapper/TypeMapper/HasOffsetTypeMapper.php b/packages/PHPStanStaticTypeMapper/TypeMapper/HasOffsetTypeMapper.php
index acee2b2ad3f..ccd6e73be6c 100644
--- a/packages/PHPStanStaticTypeMapper/TypeMapper/HasOffsetTypeMapper.php
+++ b/packages/PHPStanStaticTypeMapper/TypeMapper/HasOffsetTypeMapper.php
@@ -4,6 +4,7 @@
 
 namespace Rector\PHPStanStaticTypeMapper\TypeMapper;
 
+use PhpParser\Node;
 use PHPStan\PhpDocParser\Ast\Type\ArrayTypeNode;
 use PHPStan\PhpDocParser\Ast\Type\IdentifierTypeNode;
 use PHPStan\PhpDocParser\Ast\Type\TypeNode;
@@ -37,7 +38,7 @@ public function mapToPHPStanPhpDocTypeNode(Type $type, TypeKind $typeKind): Type
     /**
      * @param HasOffsetType $type
      */
-    public function mapToPhpParserNode(Type $type, TypeKind $typeKind): never
+    public function mapToPhpParserNode(Type $type, TypeKind $typeKind): ?Node
     {
         throw new ShouldNotHappenException();
     }
diff --git a/packages/VendorLocker/ParentClassMethodTypeOverrideGuard.php b/packages/VendorLocker/ParentClassMethodTypeOverrideGuard.php
index 8efbf047098..604a74c222c 100644
--- a/packages/VendorLocker/ParentClassMethodTypeOverrideGuard.php
+++ b/packages/VendorLocker/ParentClassMethodTypeOverrideGuard.php
@@ -7,7 +7,10 @@
 use PhpParser\Node\Stmt\ClassMethod;
 use PHPStan\Analyser\Scope;
 use PHPStan\Reflection\ClassReflection;
+use PHPStan\Reflection\FunctionVariantWithPhpDocs;
 use PHPStan\Reflection\MethodReflection;
+use PHPStan\Reflection\ParametersAcceptorSelector;
+use PHPStan\Type\MixedType;
 use PHPStan\Type\Type;
 use Rector\Core\PhpParser\AstResolver;
 use Rector\NodeNameResolver\NodeNameResolver;
@@ -35,6 +38,11 @@ public function isReturnTypeChangeAllowed(ClassMethod $classMethod): bool
             return true;
         }
 
+        $parametersAcceptor = ParametersAcceptorSelector::selectSingle($parentClassMethodReflection->getVariants());
+        if ($parametersAcceptor instanceof FunctionVariantWithPhpDocs && ! $parametersAcceptor->getNativeReturnType() instanceof MixedType) {
+            return false;
+        }
+
         $classReflection = $parentClassMethodReflection->getDeclaringClass();
         $fileName = $classReflection->getFileName();
 
@@ -95,11 +103,8 @@ private function getParentClassMethod(ClassMethod $classMethod): ?MethodReflecti
             return null;
         }
 
-        foreach ($classReflection->getAncestors() as $parentClassReflection) {
-            if ($classReflection === $parentClassReflection) {
-                continue;
-            }
-
+        $parentClassReflections = array_merge($classReflection->getParents(), $classReflection->getInterfaces());
+        foreach ($parentClassReflections as $parentClassReflection) {
             if (! $parentClassReflection->hasNativeMethod($methodName)) {
                 continue;
             }
diff --git a/rules-tests/TypeDeclaration/Rector/ClassMethod/ReturnNeverTypeRector/Fixture/skip_implements_interface_method.php.inc b/rules-tests/TypeDeclaration/Rector/ClassMethod/ReturnNeverTypeRector/Fixture/skip_implements_interface_method.php.inc
new file mode 100644
index 00000000000..63a40e8cd01
--- /dev/null
+++ b/rules-tests/TypeDeclaration/Rector/ClassMethod/ReturnNeverTypeRector/Fixture/skip_implements_interface_method.php.inc
@@ -0,0 +1,14 @@
+<?php
+namespace Rector\Tests\TypeDeclaration\Rector\ClassMethod\ReturnNeverTypeRector\Fixture;
+
+use PhpParser\Node;
+use Rector\Core\Exception\ShouldNotHappenException;
+use Rector\Tests\TypeDeclaration\Rector\ClassMethod\ReturnNeverTypeRector\Source\RunnableInterface;
+
+class SkipImplementsInterfaceMethod implements RunnableInterface
+{
+    public function run(): ?Node
+    {
+        throw new ShouldNotHappenException();
+    }
+}
diff --git a/rules-tests/TypeDeclaration/Rector/ClassMethod/ReturnNeverTypeRector/Source/RunnableInterface.php b/rules-tests/TypeDeclaration/Rector/ClassMethod/ReturnNeverTypeRector/Source/RunnableInterface.php
new file mode 100644
index 00000000000..c4ccc4a589f
--- /dev/null
+++ b/rules-tests/TypeDeclaration/Rector/ClassMethod/ReturnNeverTypeRector/Source/RunnableInterface.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\TypeDeclaration\Rector\ClassMethod\ReturnNeverTypeRector\Source;
+
+use PhpParser\Node;
+
+interface RunnableInterface
+{
+    public function run(): ?Node;
+}