Posts not appearing in communities when other group actors are mentioned.

Tried making a post (link below) to a lemmy community while also mentioning two other groups. My post never appeared in the Lemmy community.
This seems like a bug, when I tried posting to two lemmy communities at once the first went through, the second did not.

Does anyone know what’s up with this?

@lemmy_support

  • Jupiter Rowland@sh.itjust.worksEnglish
    1·
    2 days ago

    Always post in this format:

    Thread title
(Blank line)
@Lemmy_community @Friendica_group/Hubzilla_forum/(streams)_group @Guppe_group (optionally more Guppe groups)
(Blank line)
Post body
    • Jupiter Rowland@sh.itjust.worksEnglish
      1·
      2 days ago

      Essentially, the title of the post/thread comes first.

      Then comes a blank line.

      Then come the mentions, all in one line. They must always start with the Lemmy community, and you can only mention one Lemmy community. If you want to crosspost to a Friendica group, a Hubzilla forum or a (streams) group, it comes next, and AFAIK, that can only be one, too. Guppe groups come afterwards, as many as you want.

      Then comes another blank line.

      And then comes your actual post.

      Another blank line.

      Lastly, hashtags so that Mastodon has them where it expects them.