Issue #3363938: Package Manager should ignore default.settings.php and default.services.yml

package_manager/src/PathExcluder/SiteConfigurationExcluder.php

@@ -131,12 +131,12 @@ class SiteConfigurationExcluder implements EventSubscriberInterface {
    *   The full path to `sites/default` within the given root directory.
    */
   private function getDefaultSiteDirectoryPath(string $root_dir): string {
-    $dir = [$root_dir, 'sites', 'default'];
+    $dir = [$root_dir];
     $web_root = $this->pathLocator->getWebRoot();
     if ($web_root) {
-      array_splice($dir, 1, 0, $web_root);
+      $dir[] = $web_root;
     }
-    return implode(DIRECTORY_SEPARATOR, $dir);
+    return implode(DIRECTORY_SEPARATOR, [...$dir, 'sites', 'default']);
   }
 
   /**