diff --git a/core/modules/node/src/Form/NodePreviewForm.php b/core/modules/node/src/Form/NodePreviewForm.php
index ec48909..e8e7374 100644
--- a/core/modules/node/src/Form/NodePreviewForm.php
+++ b/core/modules/node/src/Form/NodePreviewForm.php
@@ -87,6 +87,10 @@ public function buildForm(array $form, FormStateInterface $form_state, EntityInt
 
     $view_mode_options = $this->entityManager->getViewModeOptionsByBundle('node', $node->bundle());
 
+    // Unset view modes that are not used in the front end.
+    unset($view_mode_options['rss']);
+    unset($view_mode_options['search_index']);
+
     $form['uuid'] = array(
       '#type' => 'value',
       '#value' => $node->uuid(),
diff --git a/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php b/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
index 9163a6d..e712440 100644
--- a/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
@@ -94,6 +94,13 @@ class EntityManagerTest extends UnitTestCase {
   protected $typedDataManager;
 
   /**
+   * The config factory.
+   *
+   * @var \Drupal\Core\Config\ConfigFactoryInterface
+   */
+  protected $configFactory;
+
+  /**
    * {@inheritdoc}
    */
   protected function setUp() {
@@ -128,6 +135,8 @@ protected function setUp() {
     $this->typedDataManager = $this->getMockBuilder('\Drupal\Core\TypedData\TypedDataManager')
       ->disableOriginalConstructor()
       ->getMock();
+
+    $this->configFactory = $this->getConfigFactoryStub();
   }
 
   /**
@@ -158,7 +167,7 @@ protected function setUpEntityManager($definitions = array()) {
       ->method('getDefinitions')
       ->will($this->returnValue($definitions));
 
-    $this->entityManager = new TestEntityManager(new \ArrayObject(), $this->moduleHandler, $this->cache, $this->languageManager, $this->translationManager, $this->getClassResolverStub(), $this->typedDataManager);
+    $this->entityManager = new TestEntityManager(new \ArrayObject(), $this->moduleHandler, $this->cache, $this->languageManager, $this->translationManager, $this->getClassResolverStub(), $this->typedDataManager, $this->configFactory);
     $this->entityManager->setContainer($this->container);
     $this->entityManager->setDiscovery($this->discovery);
   }