Reply are not visible in the articles federated by Wordpress

hello, I am doing some tests with the Wordpress federation with ActivityPub. It works very well even with Lemmy:

• articles are automatically posted to the Lemmy community if mentioned
• if I reply to a Lemmy account directly on the post, everything works well and my comment is also visible on the blog (example reply from Martufello: https://feddit.it/post/14612919 is also visible on the site: https://www.lealternative.net/2025/02/05/fridgey-unapplicazione-per-la-gestione-degli-ingredienti-in-cucina/)

but

• however, if the user receives a reply, in this case, the reply is given by "testuser," the latter is not visible in the Wordpress article (in the article, in fact, only Martufello's first response is present.).

Is it a Lemmy bug?

Thanks.