Fixed issue with dispatching events.

Closes #3396631

src/Access/AccessManager.php

@@ -204,10 +204,7 @@ class AccessManager implements AccessManagerInterface {
     // Allow other modules to add additional contexts.
     if ($plugin instanceof LayoutBuilderPermissionInterface) {
       $event = new LayoutBuilderPermissionPluginContexts($plugin, $operation, $route_match, $section_storage);
-      \Drupal::service('event_dispatcher')->dispatch(
-        LayoutBuilderPermissionPluginContexts::EVENT_NAME,
-        $event
-      );
+      \Drupal::service('event_dispatcher')->dispatch($event);
     }
   }