Drupal\comment\Controller\CommentController::getReplyForm() never returns a response object.

Confirming that this is an issue with PHPStan 2 (Level 9) when a controller is extended, e.g., for decorating purposes or any other.

final class ExampleController extends CommentController {

  public function __invoke(Request $request, EntityInterface $entity, string $field_name, ?int $pid = null): array {
    $build = parent::getReplyForm($request, $entity, $field_name, $pid);

    $children = [];
    foreach (Element::children($build) as $child) {
      $children[] = $build[$child];
    }

    return [
      '#theme' => 'example_theme_hook',
      '#children' => $children,
    ];
  }

}

This example will lead to an error:

Parameter #1 $elements of static method Drupal\Core\Render\Element::children() expects array, array|Symfony\Component\HttpFoundation\RedirectResponse given.

But it never returns a response. The proposed solution fixes it. Also, the documentation for the return type implies that it is always an array; it does not specify when it is possible to get a RedirectResponse.

This looks like either copypasta or cruft left over from a refactor - other methods in the class return redirects.

Committed/pushed to 11.x, thanks!