diff --git a/composer.json b/composer.json
index 7674b2dc056..374f51cca23 100644
--- a/composer.json
+++ b/composer.json
@@ -89,7 +89,8 @@
     },
     "conflict": {
         "doctrine/common": "<2.7",
-        "doctrine/mongodb-odm": "<2.0"
+        "doctrine/mongodb-odm": "<2.0",
+        "doctrine/mongodb-odm-bundle": "4.0.0-RC2"
     },
     "suggest": {
         "doctrine/mongodb-odm-bundle": "To support MongoDB. Only versions 4.0 and later are supported.",
diff --git a/src/JsonSchema/SchemaFactory.php b/src/JsonSchema/SchemaFactory.php
index 0d2846015e6..addfe1e5d87 100644
--- a/src/JsonSchema/SchemaFactory.php
+++ b/src/JsonSchema/SchemaFactory.php
@@ -230,7 +230,7 @@ private function getMetadata(string $resourceClass, string $type = Schema::TYPE_
             $inputOrOutput = $resourceMetadata->getTypedOperationAttribute($operationType, $operationName, $attribute, ['class' => $resourceClass], true);
         }
 
-        if (false === ($inputOrOutput['class'] ?? false)) {
+        if (null === ($inputOrOutput['class'] ?? null)) {
             // input or output disabled
             return null;
         }
diff --git a/src/Metadata/Resource/Factory/OperationResourceMetadataFactory.php b/src/Metadata/Resource/Factory/OperationResourceMetadataFactory.php
index ef2590edad1..0eaca0f67fc 100644
--- a/src/Metadata/Resource/Factory/OperationResourceMetadataFactory.php
+++ b/src/Metadata/Resource/Factory/OperationResourceMetadataFactory.php
@@ -85,7 +85,7 @@ public function create(string $resourceClass): ResourceMetadata
         if ($this->needsDefaultGetOperation($resourceMetadata)) {
             $resourceMetadata = $resourceMetadata->withItemOperations(array_merge(
                 $resourceMetadata->getItemOperations(),
-                ['get' => ['method' => 'GET', 'read' => false, 'output' => ['class' => false], 'controller' => NotFoundAction::class]])
+                ['get' => ['method' => 'GET', 'read' => false, 'output' => ['class' => null], 'controller' => NotFoundAction::class]])
             );
         }
 
@@ -162,7 +162,7 @@ private function needsDefaultGetOperation(ResourceMetadata $resourceMetadata): b
         $itemOperations = $resourceMetadata->getItemOperations();
 
         foreach ($itemOperations as $itemOperation) {
-            if ('GET' === ($itemOperation['method'] ?? false)) {
+            if ('GET' === ($itemOperation['method'] ?? null)) {
                 return false;
             }
         }
diff --git a/tests/Metadata/Resource/Factory/OperationResourceMetadataFactoryTest.php b/tests/Metadata/Resource/Factory/OperationResourceMetadataFactoryTest.php
index 4bdbbbdecb2..0ed542c0cc1 100644
--- a/tests/Metadata/Resource/Factory/OperationResourceMetadataFactoryTest.php
+++ b/tests/Metadata/Resource/Factory/OperationResourceMetadataFactoryTest.php
@@ -78,6 +78,6 @@ private function getOperations(array $names, $operationType = OperationType::ITE
 
     private function getPlaceholderOperation(): array
     {
-        return ['get' => ['method' => 'GET', 'read' => false, 'output' => ['class' => false], 'controller' => NotFoundAction::class]];
+        return ['get' => ['method' => 'GET', 'read' => false, 'output' => ['class' => null], 'controller' => NotFoundAction::class]];
     }
 }