diff -u b/core/modules/forum/tests/src/Unit/Breadcrumb/ForumBreadcrumbBuilderBaseTest.php b/core/modules/forum/tests/src/Unit/Breadcrumb/ForumBreadcrumbBuilderBaseTest.php
--- b/core/modules/forum/tests/src/Unit/Breadcrumb/ForumBreadcrumbBuilderBaseTest.php
+++ b/core/modules/forum/tests/src/Unit/Breadcrumb/ForumBreadcrumbBuilderBaseTest.php
@@ -7,8 +7,10 @@
 
 namespace Drupal\Tests\forum\Unit\Breadcrumb;
 
+use Drupal\Core\Cache\Cache;
 use Drupal\Core\Link;
 use Drupal\Tests\UnitTestCase;
+use Symfony\Component\DependencyInjection\Container;
 
 /**
  * @coversDefaultClass \Drupal\forum\Breadcrumb\ForumBreadcrumbBuilderBase
@@ -17,6 +19,22 @@
 class ForumBreadcrumbBuilderBaseTest extends UnitTestCase {
 
   /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    parent::setUp();
+
+    $cache_contexts_manager = $this->getMockBuilder('Drupal\Core\Cache\Context\CacheContextsManager')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $cache_contexts_manager->expects($this->any())
+      ->method('validate_tokens');
+    $container = new Container();
+    $container->set('cache_contexts_manager', $cache_contexts_manager);
+    \Drupal::setContainer($container);
+  }
+
+  /**
    * Tests ForumBreadcrumbBuilderBase::__construct().
    *
    * @covers ::__construct
@@ -78,6 +96,15 @@
     $vocab_item->expects($this->any())
       ->method('label')
       ->will($this->returnValue('Fora_is_the_plural_of_forum'));
+    $vocab_item->expects($this->once())
+      ->method('getCacheTags')
+      ->willReturn([]);
+    $vocab_item->expects($this->once())
+      ->method('getCacheContexts')
+      ->willReturn([]);
+    $vocab_item->expects($this->once())
+      ->method('getCacheMaxAge')
+      ->willReturn(Cache::PERMANENT);
 
     $vocab_storage = $this->getMock('Drupal\Core\Entity\EntityStorageInterface');
     $vocab_storage->expects($this->any())
diff -u b/core/modules/forum/tests/src/Unit/Breadcrumb/ForumListingBreadcrumbBuilderTest.php b/core/modules/forum/tests/src/Unit/Breadcrumb/ForumListingBreadcrumbBuilderTest.php
--- b/core/modules/forum/tests/src/Unit/Breadcrumb/ForumListingBreadcrumbBuilderTest.php
+++ b/core/modules/forum/tests/src/Unit/Breadcrumb/ForumListingBreadcrumbBuilderTest.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\Tests\forum\Unit\Breadcrumb;
 
+use Drupal\Core\Cache\Cache;
 use Drupal\Core\Link;
 use Drupal\Tests\UnitTestCase;
 use Symfony\Cmf\Component\Routing\RouteObjectInterface;
@@ -19,6 +20,22 @@
 class ForumListingBreadcrumbBuilderTest extends UnitTestCase {
 
   /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    parent::setUp();
+
+    $cache_contexts_manager = $this->getMockBuilder('Drupal\Core\Cache\Context\CacheContextsManager')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $cache_contexts_manager->expects($this->any())
+      ->method('validate_tokens');
+    $container = new Container();
+    $container->set('cache_contexts_manager', $cache_contexts_manager);
+    \Drupal::setContainer($container);
+  }
+
+  /**
    * Tests ForumListingBreadcrumbBuilder::applies().
    *
    * @param bool $expected
@@ -115,6 +132,7 @@
     $term1->expects($this->any())
       ->method('id')
       ->will($this->returnValue(1));
+    $this->addEmptyCacheableMetadata($term1);
 
     $term2 = $this->getMockBuilder('Drupal\taxonomy\Entity\Term')
       ->disableOriginalConstructor()
@@ -125,6 +143,7 @@
     $term2->expects($this->any())
       ->method('id')
       ->will($this->returnValue(2));
+    $this->addEmptyCacheableMetadata($term2);
 
     $forum_manager = $this->getMock('Drupal\forum\ForumManagerInterface');
     $forum_manager->expects($this->at(0))
@@ -139,6 +158,7 @@
     $vocab_item->expects($this->any())
       ->method('label')
       ->will($this->returnValue('Fora_is_the_plural_of_forum'));
+    $this->addEmptyCacheableMetadata($vocab_item);
     $vocab_storage = $this->getMock('Drupal\Core\Entity\EntityStorageInterface');
     $vocab_storage->expects($this->any())
       ->method('load')
@@ -172,13 +192,6 @@
       )
     );
 
-    $cache_contexts_manager = $this->getMockBuilder('Drupal\Core\Cache\Context\CacheContextsManager')
-      ->disableOriginalConstructor()
-      ->getMock();
-    $container = new Container();
-    $container->set('cache_contexts_manager', $cache_contexts_manager);
-    \Drupal::setContainer($container);
-
     // Add a translation manager for t().
     $translation_manager = $this->getStringTranslationStub();
     $breadcrumb_builder->setStringTranslation($translation_manager);
@@ -191,6 +204,7 @@
     $forum_listing->expects($this->any())
       ->method('label')
       ->will($this->returnValue('You_should_not_see_this'));
+    $this->addEmptyCacheableMetadata($forum_listing);
 
     // Our data set.
     $route_match = $this->getMock('Drupal\Core\Routing\RouteMatchInterface');
@@ -219,2 +233,19 @@
 
+  /**
+   * Adds empty CacheableMetadata for objects.
+   *
+   * @param \PHPUnit_Framework_MockObject_MockObject $object
+   */
+  protected function addEmptyCacheableMetadata(&$object) {
+    $object->expects($this->any())
+      ->method('getCacheTags')
+      ->willReturn([]);
+    $object->expects($this->any())
+      ->method('getCacheContexts')
+      ->willReturn([]);
+    $object->expects($this->any())
+      ->method('getCacheMaxAge')
+      ->willReturn(Cache::PERMANENT);
+  }
+
 }
diff -u b/core/modules/forum/tests/src/Unit/Breadcrumb/ForumNodeBreadcrumbBuilderTest.php b/core/modules/forum/tests/src/Unit/Breadcrumb/ForumNodeBreadcrumbBuilderTest.php
--- b/core/modules/forum/tests/src/Unit/Breadcrumb/ForumNodeBreadcrumbBuilderTest.php
+++ b/core/modules/forum/tests/src/Unit/Breadcrumb/ForumNodeBreadcrumbBuilderTest.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\Tests\forum\Unit\Breadcrumb;
 
+use Drupal\Core\Cache\Cache;
 use Drupal\Core\Link;
 use Drupal\Tests\UnitTestCase;
 use Symfony\Component\DependencyInjection\Container;
@@ -18,6 +19,22 @@
 class ForumNodeBreadcrumbBuilderTest extends UnitTestCase {
 
   /**
+   * {@inheritdoc}
+   */
+  public function setUp() {
+    parent::setUp();
+
+    $cache_contexts_manager = $this->getMockBuilder('Drupal\Core\Cache\Context\CacheContextsManager')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $cache_contexts_manager->expects($this->any())
+      ->method('validate_tokens');
+    $container = new Container();
+    $container->set('cache_contexts_manager', $cache_contexts_manager);
+    \Drupal::setContainer($container);
+  }
+
+  /**
    * Tests ForumNodeBreadcrumbBuilder::applies().
    *
    * @param bool $expected
@@ -121,6 +138,7 @@
     $term1->expects($this->any())
       ->method('id')
       ->will($this->returnValue(1));
+    $this->addEmptyCacheableMetadata($term1);
 
     $term2 = $this->getMockBuilder('Drupal\Core\Entity\EntityInterface')
       ->disableOriginalConstructor()
@@ -131,6 +149,7 @@
     $term2->expects($this->any())
       ->method('id')
       ->will($this->returnValue(2));
+    $this->addEmptyCacheableMetadata($term2);
 
     $forum_manager = $this->getMockBuilder('Drupal\forum\ForumManagerInterface')
       ->disableOriginalConstructor()
@@ -146,6 +165,7 @@
     $vocab_item->expects($this->any())
       ->method('label')
       ->will($this->returnValue('Forums'));
+    $this->addEmptyCacheableMetadata($vocab_item);
     $vocab_storage = $this->getMock('Drupal\Core\Entity\EntityStorageInterface');
     $vocab_storage->expects($this->any())
       ->method('load')
@@ -179,13 +199,6 @@
       )
     );
 
-    $cache_contexts_manager = $this->getMockBuilder('Drupal\Core\Cache\Context\CacheContextsManager')
-      ->disableOriginalConstructor()
-      ->getMock();
-    $container = new Container();
-    $container->set('cache_contexts_manager', $cache_contexts_manager);
-    \Drupal::setContainer($container);
-
     // Add a translation manager for t().
     $translation_manager = $this->getStringTranslationStub();
     $property = new \ReflectionProperty('Drupal\forum\Breadcrumb\ForumNodeBreadcrumbBuilder', 'stringTranslation');
@@ -224,2 +237,19 @@
 
+  /**
+   * Adds empty CacheableMetadata for objects.
+   *
+   * @param \PHPUnit_Framework_MockObject_MockObject $object
+   */
+  protected function addEmptyCacheableMetadata(&$object) {
+    $object->expects($this->any())
+      ->method('getCacheTags')
+      ->willReturn([]);
+    $object->expects($this->any())
+      ->method('getCacheContexts')
+      ->willReturn([]);
+    $object->expects($this->any())
+      ->method('getCacheMaxAge')
+      ->willReturn(Cache::PERMANENT);
+  }
+
 }
diff -u b/core/modules/taxonomy/src/TermBreadcrumbBuilder.php b/core/modules/taxonomy/src/TermBreadcrumbBuilder.php
--- b/core/modules/taxonomy/src/TermBreadcrumbBuilder.php
+++ b/core/modules/taxonomy/src/TermBreadcrumbBuilder.php
@@ -31,7 +31,7 @@
   /**
    * The taxonomy storage.
    *
-   * @var \Drupal\Core\Entity\EntityStorageInterface
+   * @var \Drupal\Core\Entity\TermStorageInterface
    */
   protected $termStorage;
 
@@ -68,8 +68,10 @@
     // @todo This overrides any other possible breadcrumb and is a pure
     //   hard-coded presumption. Make this behavior configurable per
     //   vocabulary or term.
-    while (array_reverse($parents = $this->termStorage->loadParents($term->id()))) {
-      $term = array_shift($parents);
+    $parents = $this->termStorage->loadAllParents($term->id());
+    // Remove current term being accessed.
+    array_shift($parents);
+    foreach (array_reverse($parents) as $term) {
       $term = $this->entityManager->getTranslationFromContext($term);
       $breadcrumb->addCacheableDependency($term);
       $breadcrumb->addLink(Link::createFromRoute($term->getName(), 'entity.taxonomy_term.canonical', array('taxonomy_term' => $term->id())));
only in patch2:
unchanged:
--- a/core/modules/node/src/Tests/NodeTranslationUITest.php
+++ b/core/modules/node/src/Tests/NodeTranslationUITest.php
@@ -33,7 +33,8 @@ class NodeTranslationUITest extends ContentTranslationUITestBase {
     'route.menu_active_trails:main',
     'route.menu_active_trails:tools',
     'timezone',
-    'user.roles'
+    'user.roles',
+    'url.path',
   ];
 
   /**