Issue #3346721: Several usages of this when not in object context

src/Form/PreviewActionsForm.php

@@ -30,7 +30,7 @@ class PreviewActionsForm extends FormBase {
    * @param \Drupal\entity_reference_preview\Plugin\PreviewDetector\CookiePreviewDetector $cookie_detector
    *   The state detector plugin.
    */
-  public function __construct(CookiePreviewDetector $cookie_detector, private PreviewDetectorPluginManager $previewDetectorPluginManager) {
+  public function __construct(CookiePreviewDetector $cookie_detector) {
     $this->cookieDetector = $cookie_detector;
   }
 
@@ -38,7 +38,7 @@ class PreviewActionsForm extends FormBase {
    * {@inheritdoc}
    */
   public static function create(ContainerInterface $container) {
-    $cookie_detector = $this->previewDetectorPluginManager
+    $cookie_detector = $container->get(PreviewDetectorPluginManager::class)
       ->createInstance('cookie');
     return new static($cookie_detector);
   }