diff --git a/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php b/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
index b7bf2e15d5bc2..732586bd85f9b 100644
--- a/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
+++ b/src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php
@@ -309,16 +309,20 @@ protected function getAttributes(object $object, ?string $format, array $context
             return $this->attributesCache[$key];
         }
 
-        $attributes = $this->extractAttributes($object, $format, $context);
+        $allowedAttributes = $this->getAllowedAttributes($object, $context, true);
 
-        if ($this->classDiscriminatorResolver && $mapping = $this->classDiscriminatorResolver->getMappingForMappedObject($object)) {
-            array_unshift($attributes, $mapping->getTypeProperty());
+        if (false !== $allowedAttributes) {
+            if ($context['cache_key']) {
+                $this->attributesCache[$key] = $allowedAttributes;
+            }
+
+            return $allowedAttributes;
         }
 
-        $allowedAttributes = $this->getAllowedAttributes($object, $context, true);
+        $attributes = $this->extractAttributes($object, $format, $context);
 
-        if (false !== $allowedAttributes) {
-            $attributes = $attributes ? array_intersect($attributes, $allowedAttributes) : $allowedAttributes;
+        if ($this->classDiscriminatorResolver && $mapping = $this->classDiscriminatorResolver->getMappingForMappedObject($object)) {
+            array_unshift($attributes, $mapping->getTypeProperty());
         }
 
         if ($context['cache_key'] && \stdClass::class !== $class) {
diff --git a/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php b/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php
index cf33e8e604848..35616b658ba78 100644
--- a/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/Normalizer/AbstractObjectNormalizerTest.php
@@ -17,7 +17,6 @@
 use Symfony\Component\PropertyInfo\Extractor\ReflectionExtractor;
 use Symfony\Component\PropertyInfo\PropertyInfoExtractor;
 use Symfony\Component\PropertyInfo\Type;
-use Symfony\Component\Serializer\Annotation\Ignore;
 use Symfony\Component\Serializer\Exception\ExtraAttributesException;
 use Symfony\Component\Serializer\Exception\InvalidArgumentException;
 use Symfony\Component\Serializer\Exception\LogicException;
@@ -455,14 +454,6 @@ public function testNormalizeEmptyObject()
         $this->assertEquals(new \ArrayObject(), $normalizedData);
     }
 
-    public function testNormalizeWithIgnoreAnnotationAndPrivateProperties()
-    {
-        $classMetadataFactory = new ClassMetadataFactory(new AnnotationLoader(new AnnotationReader()));
-        $normalizer = new ObjectNormalizer($classMetadataFactory);
-
-        $this->assertSame(['foo' => 'foo'], $normalizer->normalize(new ObjectDummyWithIgnoreAnnotationAndPrivateProperty()));
-    }
-
     public function testNormalizeBasedOnAllowedAttributes()
     {
         $normalizer = new class() extends AbstractObjectNormalizer {
@@ -586,16 +577,6 @@ class EmptyDummy
 {
 }
 
-class ObjectDummyWithIgnoreAnnotationAndPrivateProperty
-{
-    public $foo = 'foo';
-
-    /** @Ignore */
-    public $ignored = 'ignored';
-
-    private $private = 'private';
-}
-
 class AbstractObjectNormalizerWithMetadata extends AbstractObjectNormalizer
 {
     public function __construct()
diff --git a/src/Symfony/Component/Serializer/Tests/SerializerTest.php b/src/Symfony/Component/Serializer/Tests/SerializerTest.php
index 65f7fd9d508eb..12d8eeefdd1a0 100644
--- a/src/Symfony/Component/Serializer/Tests/SerializerTest.php
+++ b/src/Symfony/Component/Serializer/Tests/SerializerTest.php
@@ -473,7 +473,7 @@ public function testDeserializeAndSerializeInterfacedObjectsWithTheClassMetadata
             'groups' => ['two'],
         ]);
 
-        $this->assertEquals('{"type":"one","two":2}', $serialized);
+        $this->assertEquals('{"two":2,"type":"one"}', $serialized);
     }
 
     public function testDeserializeAndSerializeNestedInterfacedObjectsWithTheClassMetadataDiscriminator()

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