diff -u b/core/lib/Drupal/Core/Theme/Registry.php b/core/lib/Drupal/Core/Theme/Registry.php
--- b/core/lib/Drupal/Core/Theme/Registry.php
+++ b/core/lib/Drupal/Core/Theme/Registry.php
@@ -638,12 +638,18 @@
         $base_hook = $hook;
         while (!isset($cache[$base_hook]) && $pos = strrpos($base_hook, '__')) {
           $base_hook = substr($base_hook, 0, $pos);
-          $cache[$hook]['base hook'] = $base_hook;
-          $cache[$hook]['preprocess functions'][] = $processor;
           // If the current hook is based on a pattern, get the base hook.
           if (isset($cache[$hook]['base hook'])) {
             $base_hook = $cache[$hook]['base hook'];
           }
+          // If base hook exists clone of it for the preprocess function
+          // without a template.
+          // @see https://www.drupal.org/node/2457295
+          if (isset($cache[$base_hook])) {
+            $cache[$hook] = $cache[$base_hook];
+            $cache[$hook]['base hook'] = $base_hook;
+            $cache[$hook]['preprocess functions'][] = $processor;
+          }
         }
       }
     }
diff -u b/core/modules/system/src/Tests/Theme/ThemeTest.php b/core/modules/system/src/Tests/Theme/ThemeTest.php
--- b/core/modules/system/src/Tests/Theme/ThemeTest.php
+++ b/core/modules/system/src/Tests/Theme/ThemeTest.php
@@ -310,8 +310,8 @@
         'Kitten',
         'Flamingo',
       ];
-      foreach ($items as $key => $item) {
-        $this->assertEqual((string) $item, $expected_values[$key]);
+      foreach ($expected_values as $key => $value) {
+        $this->assertEqual((string) $value, $items[$key]);
       }
     }
   }