Import does'nt work

Hi,
As the public version throw fatal error on export (missing parameter) I've used the dev version.
But this time it's import that doesn't work.
First thing is the use of $key instead $menu_name to check existence of a menu :

      if (!Menu::load($key)) {
        $invalidMenus[] = $menu_name;
        continue;
      }

Second the module check existence of the combinaison of menu-name and menu-link-id.

      $menuLinkEntity = \Drupal::entityQuery('menu_link_content')
        ->condition('menu_name', $menu_name)
        ->condition('id', $key)
        ->execute();

The good practice is to use the UUID instead.
Other point is to unset the menu ID to prevent duplicate PRIMARY KEY exception.