Drupal 8 : all menu items always visible

MenuLinkTree.php

<?php

// File name : my_module/src/Menu/MenuLinkTree.php

/**
 * @file
 * Contains \Drupal\my_module\Menu\MenuLinkTree.
 */

namespace Drupal\my_module\Menu;

use Drupal\Core\Access\AccessResult;
use Drupal\Core\Menu\MenuLinkTree as MenuLinkTreeCore;

/**
 * Override \Drupal\Core\Menu\MenuLinkTree.
 *
 * @see \Drupal\my_module\MyModuleServiceProvider::alter()
 */
class MenuLinkTree extends MenuLinkTreeCore {

  /**
   * {@inheritdoc}
   */
  protected function createInstances(array $data_tree) {
    $tree = parent::createInstances($data_tree);
    foreach ($tree as $key => $element) {
      $tree[$key]->access = AccessResult::allowed();
    }
    return $tree;
  }

}

MyModuleServiceProvider.php

<?php

// File name : my_module/src/MyModuleServiceProvider.php

/**
 * @file
 * Contains \Drupal\my_module\MyModuleServiceProvider.
 */

namespace Drupal\my_module;

use Drupal\Core\DependencyInjection\ContainerBuilder;
use Drupal\Core\DependencyInjection\ServiceProviderBase;

/**
 * Class MyModuleServiceProvider.
 */
class MyModuleServiceProvider extends ServiceProviderBase {

  /**
   * {@inheritdoc}
   */
  public function alter(ContainerBuilder $container) {
    $definition = $container->getDefinition('menu.link_tree');
    $definition->setClass('Drupal\my_module\Menu\MenuLinkTree');
  }

}