core/modules/jsonapi/src/Normalizer/ResourceObjectNormalizer.php | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/core/modules/jsonapi/src/Normalizer/ResourceObjectNormalizer.php b/core/modules/jsonapi/src/Normalizer/ResourceObjectNormalizer.php
index cd6c8d0f12..e9e8be8981 100644
--- a/core/modules/jsonapi/src/Normalizer/ResourceObjectNormalizer.php
+++ b/core/modules/jsonapi/src/Normalizer/ResourceObjectNormalizer.php
@@ -78,9 +78,8 @@ public function normalize($object, $format = NULL, array $context = []) {
     $relationship_field_names = array_keys($resource_type->getRelatableResourceTypes());
     $attributes = array_diff_key($field_normalizations, array_flip($relationship_field_names));
     $relationships = array_intersect_key($field_normalizations, array_flip($relationship_field_names));
-    $entity_normalizaton = array_filter(array_merge(
-      $normalization_parts[ResourceObjectNormalizationCacher::RESOURCE_CACHE_SUBSET_BASE],
-      [
+    $entity_normalizaton = array_filter(
+      $normalization_parts[ResourceObjectNormalizationCacher::RESOURCE_CACHE_SUBSET_BASE] + [
         'attributes' => CacheableNormalization::aggregate($attributes)->omitIfEmpty(),
         'relationships' => CacheableNormalization::aggregate($relationships)->omitIfEmpty(),
       ]