diff --git a/src/Symfony/Component/PropertyInfo/Extractor/ReflectionExtractor.php b/src/Symfony/Component/PropertyInfo/Extractor/ReflectionExtractor.php
index 59af87584b..d17b1c8467 100644
--- a/src/Symfony/Component/PropertyInfo/Extractor/ReflectionExtractor.php
+++ b/src/Symfony/Component/PropertyInfo/Extractor/ReflectionExtractor.php
@@ -243,7 +243,7 @@ class ReflectionExtractor implements PropertyListExtractorInterface, PropertyTyp
 
         foreach ($reflectionType instanceof \ReflectionUnionType ? $reflectionType->getTypes() : [$reflectionType] as $type) {
             $phpTypeOrClass = $reflectionType instanceof \ReflectionNamedType ? $reflectionType->getName() : (string) $type;
-            if ('null' === $phpTypeOrClass) {
+            if ('null' === $phpTypeOrClass || 'mixed' === $phpTypeOrClass) {
                 continue;
             }
 
diff --git a/src/Symfony/Component/PropertyInfo/Tests/Extractor/ReflectionExtractorTest.php b/src/Symfony/Component/PropertyInfo/Tests/Extractor/ReflectionExtractorTest.php
index bac036aa5b..5ce1e7ba4c 100644
--- a/src/Symfony/Component/PropertyInfo/Tests/Extractor/ReflectionExtractorTest.php
+++ b/src/Symfony/Component/PropertyInfo/Tests/Extractor/ReflectionExtractorTest.php
@@ -221,6 +221,8 @@ class ReflectionExtractorTest extends TestCase
             ['timeout', [new Type(Type::BUILTIN_TYPE_INT), new Type(Type::BUILTIN_TYPE_FLOAT)]],
             ['optional', [new Type(Type::BUILTIN_TYPE_INT, true), new Type(Type::BUILTIN_TYPE_FLOAT, true)]],
             ['string', [new Type(Type::BUILTIN_TYPE_OBJECT, false, 'Stringable'), new Type(Type::BUILTIN_TYPE_STRING)]],
+            ['payload', null],
+            ['data', null],
         ];
     }
 
diff --git a/src/Symfony/Component/PropertyInfo/Tests/Fixtures/Php80Dummy.php b/src/Symfony/Component/PropertyInfo/Tests/Fixtures/Php80Dummy.php
index 484498f4a6..3e1ffba662 100644
--- a/src/Symfony/Component/PropertyInfo/Tests/Fixtures/Php80Dummy.php
+++ b/src/Symfony/Component/PropertyInfo/Tests/Fixtures/Php80Dummy.php
@@ -23,4 +23,12 @@ class Php80Dummy
     public function setString(string|\Stringable $string)
     {
     }
+
+    public function setPayload(mixed $payload)
+    {
+    }
+
+    public function getData(): mixed
+    {
+    }
 }