preprocess_menu causes information loss when multilingual option is enabled

In function menu_manipulator_preprocess_menu the filtering of languages is applied this way:

if ($do_filter) {
         $menu_tree_translated = menu_manipulator_get_multilingual_menu($variables['menu_name']);
         $variables['items']   = isset($menu_tree_translated['#items']) ? $menu_tree_translated['#items'] : [];
}

but this causes information loss.
if i print my $variables['items'] before and after this if ($do_filter) its very obvious.
(in the following images i printed from a menu that is using also menu_item_extras.)

$variables['items'] before the if:

and $variables['items'] after the if:

to fix it i used my theme hook:

// Implements theme_preprocess_menu().
function MYTHEMEpreprocess_menu(&$variables, $hook){
  $menu_name = 'my-menu-name';
  $moduleHandler = \Drupal::service('module_handler');
  if (isset($variables['menu_name']) &&  $menu_name == $variables['menu_name']) {
    if ($moduleHandler->moduleExists('menu_manipulator')) {
      $menu_tree_translated = menu_manipulator_get_multilingual_menu($menu_name);
      if (isset($menu_tree_translated['#items'])) {
        $variables['items'] = array_intersect_key($variables['items'], $menu_tree_translated['#items']);
      } else {
        $variables['items'] = [];
      }
    }
  }
}

perhaps the intercetion should be implemented in menu_manipulator_preprocess_menu
I added a naively implemented patch.