manager-bundle/src/HttpKernel/ContaoKernel.php
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());
    }
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());
    }
{@inheritdoc}