diff --git a/core/modules/system/tests/themes/test_theme/test_theme.info.yml b/core/modules/system/tests/themes/test_theme/test_theme.info.yml
index fca49c2..4c1568c 100644
--- a/core/modules/system/tests/themes/test_theme/test_theme.info.yml
+++ b/core/modules/system/tests/themes/test_theme/test_theme.info.yml
@@ -44,12 +44,12 @@ libraries-override:
   core/drupal.dropbutton:
     css:
       component:
-        /core/themes/stable/css/core/dropbutton/dropbutton.css: /themes/my_theme/css/dropbutton.css
+        misc/dropbutton/dropbutton.css: /themes/my_theme/css/dropbutton.css
   # Use stream wrappers.
   core/drupal.vertical-tabs:
     css:
       component:
-        /core/themes/stable/css/core/vertical-tabs.css: public://my_css/vertical-tabs.css
+        misc/vertical-tabs.css: public://my_css/vertical-tabs.css
   # Use a protocol-relative URI.
   core/jquery.ui:
     css:
diff --git a/core/modules/views/src/Tests/Plugin/StyleGridTest.php b/core/modules/views/src/Tests/Plugin/StyleGridTest.php
index 698d2ba..6dbac6b 100644
--- a/core/modules/views/src/Tests/Plugin/StyleGridTest.php
+++ b/core/modules/views/src/Tests/Plugin/StyleGridTest.php
@@ -53,7 +53,7 @@ public function testGrid() {
 
     // Ensure styles are properly added for grid views.
     $this->drupalGet('test-grid');
-    $this->assertRaw('stable/css/views/views.module.css');
+    $this->assertRaw('views/css/views.module.css');
   }
 
   /**
diff --git a/core/themes/classy/templates/block/block--local-actions-block.html.twig b/core/themes/classy/templates/block/block--local-actions-block.html.twig
index dbe2557..97df94b 100644
--- a/core/themes/classy/templates/block/block--local-actions-block.html.twig
+++ b/core/themes/classy/templates/block/block--local-actions-block.html.twig
@@ -1,4 +1,4 @@
-{% extends "@stable/block/block.html.twig" %}
+{% extends "block.html.twig" %}
 {#
 /**
  * @file
diff --git a/core/themes/classy/templates/block/block--local-tasks-block.html.twig b/core/themes/classy/templates/block/block--local-tasks-block.html.twig
index ff960a5..0f25f59 100644
--- a/core/themes/classy/templates/block/block--local-tasks-block.html.twig
+++ b/core/themes/classy/templates/block/block--local-tasks-block.html.twig
@@ -1,4 +1,4 @@
-{% extends "@stable/block/block.html.twig" %}
+{% extends "block.html.twig" %}
 {#
 /**
  * @file