code: protected function initializeContainer(): void
      {
          parent::initializeContainer();
  
          if (null === ($container = $this->getContainer())) {
              return;
          }
  
          // Set the plugin loader again so it is available at runtime (synthetic service)
          $container->set('contao_manager.plugin_loader', $this->getPluginLoader());
      }
docs: {@inheritdoc}