diff --git a/docs/running_psalm/issues/MethodSignatureMustProvideReturnType.md b/docs/running_psalm/issues/MethodSignatureMustProvideReturnType.md
index 80aa53c8ac2..0c85db90d36 100644
--- a/docs/running_psalm/issues/MethodSignatureMustProvideReturnType.md
+++ b/docs/running_psalm/issues/MethodSignatureMustProvideReturnType.md
@@ -8,7 +8,6 @@ This issue is emitted when a method overriding a native method is defined withou
 
 ```php
 <?php
-
 class A implements JsonSerializable {
     public function jsonSerialize() {
         return ['type' => 'A'];
diff --git a/psalm-baseline.xml b/psalm-baseline.xml
index dcd0433d3dd..3b9bb725ee3 100644
--- a/psalm-baseline.xml
+++ b/psalm-baseline.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<files psalm-version="4.x-dev@64206d9c3a9723bba093beb7d1a77ee767332d8a">
+<files psalm-version="4.x-dev@603714518b3894a57b464920b906a13332f23c02">
   <file src="examples/TemplateChecker.php">
     <PossiblyUndefinedIntArrayOffset occurrences="2">
       <code>$comment_block-&gt;tags['variablesfrom'][0]</code>
@@ -21,6 +21,9 @@
       <code>$matches[0]</code>
       <code>$symbol_parts[1]</code>
     </PossiblyUndefinedIntArrayOffset>
+    <PossiblyUnusedProperty occurrences="1">
+      <code>$analysis_php_version_id</code>
+    </PossiblyUnusedProperty>
   </file>
   <file src="src/Psalm/Config.php">
     <DeprecatedMethod occurrences="3">
@@ -659,6 +662,11 @@
       <code>array_keys($template_type_map[$template_param_name])[0]</code>
     </PossiblyUndefinedIntArrayOffset>
   </file>
+  <file src="src/Psalm/Issue/MethodSignatureMustProvideReturnType.php">
+    <UnusedClass occurrences="1">
+      <code>MethodSignatureMustProvideReturnType</code>
+    </UnusedClass>
+  </file>
   <file src="src/Psalm/Node/Stmt/VirtualClass.php">
     <PropertyNotSetInConstructor occurrences="1">
       <code>VirtualClass</code>
diff --git a/src/Psalm/Internal/Analyzer/MethodComparator.php b/src/Psalm/Internal/Analyzer/MethodComparator.php
index dd0b6ee6497..16ff2d9d98b 100644
--- a/src/Psalm/Internal/Analyzer/MethodComparator.php
+++ b/src/Psalm/Internal/Analyzer/MethodComparator.php
@@ -21,14 +21,12 @@
 use Psalm\Issue\ImplementedReturnTypeMismatch;
 use Psalm\Issue\LessSpecificImplementedReturnType;
 use Psalm\Issue\MethodSignatureMismatch;
-use Psalm\Issue\MethodSignatureMustProvideReturnType;
 use Psalm\Issue\MissingImmutableAnnotation;
 use Psalm\Issue\MoreSpecificImplementedParamType;
 use Psalm\Issue\OverriddenMethodAccess;
 use Psalm\Issue\ParamNameMismatch;
 use Psalm\Issue\TraitMethodSignatureMismatch;
 use Psalm\IssueBuffer;
-use Psalm\Storage\AttributeStorage;
 use Psalm\Storage\ClassLikeStorage;
 use Psalm\Storage\FunctionLikeParameter;
 use Psalm\Storage\MethodStorage;
@@ -37,7 +35,6 @@
 use Psalm\Type\Atomic\TTemplateParam;
 use Psalm\Type\Union;
 
-use function array_filter;
 use function in_array;
 use function strpos;
 use function strtolower;
@@ -116,29 +113,6 @@ public static function compare(
             );
         }
 
-        if (!$guide_classlike_storage->user_defined
-            && $implementer_classlike_storage->user_defined
-            && $codebase->analysis_php_version_id >= 80100
-            && ($guide_method_storage->return_type
-                || $guide_method_storage->signature_return_type
-            )
-            && !$implementer_method_storage->signature_return_type
-            && !array_filter(
-                $implementer_method_storage->attributes,
-                function (AttributeStorage $s) {
-                    return $s->fq_class_name === 'ReturnTypeWillChange';
-                }
-            )
-        ) {
-            IssueBuffer::maybeAdd(
-                new MethodSignatureMustProvideReturnType(
-                    'Method ' . $cased_implementer_method_id . ' must have a return type signature!',
-                    $implementer_method_storage->location ?: $code_location
-                ),
-                $suppressed_issues + $implementer_classlike_storage->suppressed_issues
-            );
-        }
-
         if ($guide_method_storage->return_type
             && $implementer_method_storage->return_type
             && !$implementer_method_storage->inherited_return_type
@@ -888,14 +862,7 @@ private static function compareMethodSignatureReturnTypes(
                 $implementer_signature_return_type,
                 $guide_signature_return_type
             )
-            : (!$implementer_signature_return_type
-                && $guide_signature_return_type->isMixed()
-                ? false
-                : UnionTypeComparator::isContainedByInPhp(
-                    $implementer_signature_return_type,
-                    $guide_signature_return_type
-                )
-            );
+            : UnionTypeComparator::isContainedByInPhp($implementer_signature_return_type, $guide_signature_return_type);
 
         if (!$is_contained_by) {
             if ($codebase->php_major_version >= 8
diff --git a/tests/DocumentationTest.php b/tests/DocumentationTest.php
index f721041cab5..31c392d1aff 100644
--- a/tests/DocumentationTest.php
+++ b/tests/DocumentationTest.php
@@ -218,10 +218,6 @@ public function testInvalidCode($code, $error_message, $error_levels = [], $chec
             $this->markTestSkipped();
         }
 
-        if (strpos($error_message, 'MethodSignatureMustProvideReturnType') !== false) {
-            $php_version = '8.1';
-        }
-
         $this->project_analyzer->setPhpVersion($php_version, 'tests');
 
         if ($check_references) {
@@ -293,6 +289,10 @@ public function providerInvalidCodeParse(): array
                 case 'TraitMethodSignatureMismatch':
                     continue 2;
 
+                /** @todo reinstate this test when the issue is restored */
+                case 'MethodSignatureMustProvideReturnType':
+                    continue 2;
+
                 case 'InvalidFalsableReturnType':
                     $ignored_issues = ['FalsableReturnStatement'];
                     break;
diff --git a/tests/MethodSignatureTest.php b/tests/MethodSignatureTest.php
index 87c3bc71dbf..11f217b172f 100644
--- a/tests/MethodSignatureTest.php
+++ b/tests/MethodSignatureTest.php
@@ -1569,37 +1569,6 @@ public function bar(string ...$_args): void {}
                 ',
                 'error_message' => 'MethodSignatureMismatch',
             ],
-            'noMixedTypehintInDescendant' => [
-                '<?php
-                    class a {
-                        public function test(): mixed {
-                            return 0;
-                        }
-                    }
-                    class b extends a {
-                        public function test() {
-                            return 0;
-                        }
-                    }
-                ',
-                'error_message' => 'MethodSignatureMismatch',
-                [],
-                false,
-                '8.0'
-            ],
-            'noTypehintInNativeDescendant' => [
-                '<?php
-                    class a implements JsonSerializable {
-                        public function jsonSerialize() {
-                            return 0;
-                        }
-                    }
-                ',
-                'error_message' => 'MethodSignatureMustProvideReturnType',
-                [],
-                false,
-                '8.1'
-            ],
         ];
     }
 }