Steps to reproduce the issue

I tried to modify mod_articles_latest by adding support for ajax. Because of unresolved issue in #32136 I added dummy helper.php to include ArticlesLatestHelper.php and added getAjax function into ArticlesLatestHelper.php.
But everytime I tried to access this url index.php?option=com_ajax&module=articles_latest&method=get&format=json it always returned {"success":false,"message":"Method getAjax does not exist.","messages":null,"data":null}

I think this is still related to namespaced module's issue because when I tried to comment namespace Joomla\Module\ArticlesLatest\Site\Helper; and rename Helper Class name from ArticlesLatestHelper to ModArticlesLatestHelper it returned {"success":true,"message":null,"messages":null,"data":"yes it works"}

System information (as much as possible)

Joomla 4 beta 7