reverted:
--- b/core/modules/system/lib/Drupal/system/Plugin/ImageToolkitManager.php
+++ a/core/modules/system/lib/Drupal/system/Plugin/ImageToolkitManager.php
@@ -29,7 +29,7 @@
    */
   public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, LanguageManager $language_manager) {
     parent::__construct('Plugin/ImageToolkit', $namespaces, 'Drupal\system\Annotation\ImageToolkit');
+    $this->setCacheBackend($cache_backend, $language_manager, 'image_toolkit');
-    $this->setCacheBackend($cache_backend, $language_manager, 'image_toolkit_plugins');
   }
 
   /**
only in patch2:
unchanged:
--- a/core/lib/Drupal/Core/ImageToolkit/ImageToolkitManager.php
+++ b/core/lib/Drupal/Core/ImageToolkit/ImageToolkitManager.php
@@ -40,7 +40,7 @@ class ImageToolkitManager extends DefaultPluginManager {
   public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, LanguageManager $language_manager, ConfigFactory $config_factory) {
     parent::__construct('Plugin/ImageToolkit', $namespaces, 'Drupal\Core\ImageToolkit\Annotation\ImageToolkit');
 
-    $this->setCacheBackend($cache_backend, $language_manager, 'image_toolkit');
+    $this->setCacheBackend($cache_backend, $language_manager, 'image_toolkit_plugins');
     $this->configFactory = $config_factory;
   }