Issue #3508142: Fix installation error with JSON:API Extra in custom Drupal 11 profiles due to missing synthetic service `kernel`

Issue #3508142: Fix installation error with JSON:API Extra in custom Drupal 11 profiles due to missing synthetic service kernel

Closes #3508142

src/EventSubscriber/ConfigSubscriber.php

@@ -59,7 +59,7 @@ class ConfigSubscriber implements EventSubscriberInterface {
   public function onSave(ConfigCrudEvent $event) {
     $container = \Drupal::getContainer();
     // It is problematic to rebuild the container during the installation.
-    $should_process = $container->getParameter('kernel.environment') !== 'install'
+    $should_process = (!defined('MAINTENANCE_MODE') || (defined('MAINTENANCE_MODE') && MAINTENANCE_MODE !== 'install'))
       && (!$container->hasParameter('jsonapi_extras.base_path_override_disabled') || !$container->getParameter('jsonapi_extras.base_path_override_disabled'))
       && $event->getConfig()->getName() === 'jsonapi_extras.settings';
     if ($should_process) {