core/modules/rest/src/Plugin/rest/resource/EntityResource.php | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/core/modules/rest/src/Plugin/rest/resource/EntityResource.php b/core/modules/rest/src/Plugin/rest/resource/EntityResource.php
index 4b4d027..6428cbb 100644
--- a/core/modules/rest/src/Plugin/rest/resource/EntityResource.php
+++ b/core/modules/rest/src/Plugin/rest/resource/EntityResource.php
@@ -145,7 +145,14 @@ public function patch(EntityInterface $original_entity, EntityInterface $entity
 
     // Overwrite the received properties.
     $langcode_key = $entity->getEntityType()->getKey('langcode');
+    $bundle_key = $entity->getEntityType()->getKey('bundle');
     foreach ($entity->_restSubmittedFields as $field_name) {
+      // \Drupal\serialization\Normalizer\EntityNormalizer::denormalize() needs
+      // the bundle to be able to denormalize the entity.
+      if ($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.