diff --git a/src/lib/Output/Generator/Json.php b/src/lib/Output/Generator/Json.php
index fa22860b..37d8b810 100644
--- a/src/lib/Output/Generator/Json.php
+++ b/src/lib/Output/Generator/Json.php
@@ -143,7 +143,7 @@ public function startObjectElement($name, $mediaTypeName = null)
 
         $object = new Json\JsonObject($this->json);
 
-        if ($this->json instanceof Json\ArrayObject) {
+        if ($this->json instanceof Json\ArrayObject || $this->json instanceof Data\ArrayList) {
             $this->json->append($object);
             $this->json = $object;
         } else {
diff --git a/src/lib/Output/Normalizer/ArrayObjectNormalizer.php b/src/lib/Output/Normalizer/ArrayObjectNormalizer.php
index 9b5af3de..948b6d56 100644
--- a/src/lib/Output/Normalizer/ArrayObjectNormalizer.php
+++ b/src/lib/Output/Normalizer/ArrayObjectNormalizer.php
@@ -21,8 +21,6 @@ public function normalize($object, ?string $format = null, array $context = []):
     {
         $data = get_object_vars($object);
 
-        unset($data['_ref_parent']);
-
         foreach ($data as $key => $value) {
             $data[$key] = $this->normalize($value, $format, $context);
         }
diff --git a/src/lib/Output/Normalizer/JsonObjectNormalizer.php b/src/lib/Output/Normalizer/JsonObjectNormalizer.php
index bb2dc785..f76fbb04 100644
--- a/src/lib/Output/Normalizer/JsonObjectNormalizer.php
+++ b/src/lib/Output/Normalizer/JsonObjectNormalizer.php
@@ -25,8 +25,6 @@ public function normalize($object, ?string $format = null, array $context = []):
     {
         $vars = get_object_vars($object);
 
-        unset($vars['_ref_parent']);
-
         foreach ($vars as $name => $value) {
             $vars[$name] = $this->normalizer->normalize($value, $format, $context);
         }