.../src/Plugin/rest/resource/EntityResource.php    | 26 +++++++++++-----------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/core/modules/rest/src/Plugin/rest/resource/EntityResource.php b/core/modules/rest/src/Plugin/rest/resource/EntityResource.php
index 0477982..0b63598 100644
--- a/core/modules/rest/src/Plugin/rest/resource/EntityResource.php
+++ b/core/modules/rest/src/Plugin/rest/resource/EntityResource.php
@@ -144,21 +144,21 @@ public function patch(EntityInterface $original_entity, EntityInterface $entity
     }
 
     // Overwrite the received properties.
-    $langcode_key = $entity->getEntityType()->getKey('langcode');
-    $bundle_key = $entity->getEntityType()->getKey('bundle');
+    $entity_keys = array_values($entity->getEntityType()->getKeys());
     foreach ($entity->_restSubmittedFields as $field_name) {
-      // \Drupal\serialization\Normalizer\EntityNormalizer::denormalize() needs
-      // the bundle to be able to denormalize the entity, if the entity type has
-      // a bundle key.
-      if ($bundle_key && $field_name === $bundle_key) {
-        continue;
-      }
-
       $field = $entity->get($field_name);
-      // It is not possible to set the language to NULL as it is automatically
-      // re-initialized. As it must not be empty, skip it if it is.
-      if ($field_name == $langcode_key && $field->isEmpty()) {
-        continue;
+
+      // Entity key fields need special treatment.
+      if (in_array($field_name, $entity_keys)) {
+        // Unchanged Values for entity keys same don't need access checking.
+        if ($original_entity->get($field_name)->getValue() === $entity->get($field_name)->getValue()) {
+          continue;
+        }
+        // It is not possible to set the language to NULL as it is automatically
+        // re-initialized. As it must not be empty, skip it if it is.
+        else if ($field_name === $entity_keys['langcode'] && $field->isEmpty()) {
+          continue;
+        }
       }
 
       if (!$original_entity->get($field_name)->access('edit')) {