diff -u b/core/modules/aggregator/src/FeedForm.php b/core/modules/aggregator/src/FeedForm.php
--- b/core/modules/aggregator/src/FeedForm.php
+++ b/core/modules/aggregator/src/FeedForm.php
@@ -39,3 +39,2 @@
 
-  
 }
diff -u b/core/modules/search/src/Form/SearchPageAddForm.php b/core/modules/search/src/Form/SearchPageAddForm.php
--- b/core/modules/search/src/Form/SearchPageAddForm.php
+++ b/core/modules/search/src/Form/SearchPageAddForm.php
@@ -42,7 +42,7 @@
       $this->searchPageRepository->setDefaultSearchPage($this->entity);
     }
 
-    $status = $this->entity->save();
+    $status = parent::save($form, $form_state);
 
     drupal_set_message($this->t('The %label search page has been added.', array('%label' => $this->entity->label())));
     return $status;
diff -u b/core/modules/search/src/Form/SearchPageEditForm.php b/core/modules/search/src/Form/SearchPageEditForm.php
--- b/core/modules/search/src/Form/SearchPageEditForm.php
+++ b/core/modules/search/src/Form/SearchPageEditForm.php
@@ -27,7 +27,7 @@
    * {@inheritdoc}
    */
   public function save(array $form, FormStateInterface $form_state) {
-    $status = $this->entity->save();
+    $status = parent::save($form, $form_state);
 
     drupal_set_message($this->t('The %label search page has been updated.', array('%label' => $this->entity->label())));
     return $status;
diff -u b/core/modules/system/tests/modules/entity_test/src/EntityTestForm.php b/core/modules/system/tests/modules/entity_test/src/EntityTestForm.php
--- b/core/modules/system/tests/modules/entity_test/src/EntityTestForm.php
+++ b/core/modules/system/tests/modules/entity_test/src/EntityTestForm.php
@@ -71,19 +71,12 @@
       }
       drupal_set_message($message);
 
-      if ($entity->id()) {
-        $entity_type = $entity->getEntityTypeId();
-        $form_state->setRedirect(
-          "entity.$entity_type.edit_form",
-          array($entity_type => $entity->id())
-        );
-        return $status;
-      }
-      else {
-        // Error on save.
-        drupal_set_message(t('The entity could not be saved.'), 'error');
-        $form_state->setRebuild();
-      }
+      $entity_type = $entity->getEntityTypeId();
+      $form_state->setRedirect(
+        "entity.$entity_type.edit_form",
+        array($entity_type => $entity->id())
+      );
+      return $status;
     }
     catch (\Exception $e) {
       \Drupal::state()->set('entity_test.form.save.exception', get_class($e) . ': ' . $e->getMessage());
only in patch2:
unchanged:
--- a/core/modules/system/tests/modules/entity_test/src/Entity/EntityTestMulChanged.php
+++ b/core/modules/system/tests/modules/entity_test/src/Entity/EntityTestMulChanged.php
@@ -70,7 +70,7 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
   public function save() {
     // Ensure a new timestamp.
     sleep(1);
-    parent::save();
+    return parent::save();
   }
 
   /**