If this where to happen, my guess is it’s the same as Mastodon and many other platrforms that are also microblogging!
For example, if you “mention” a community from Mastodon within a post the post will show up on that community. Here’s an example I just posted from Mastodon to Lemmy: geddit.social/post/183439
Just tried and I can! You can clear browser cache and cookies and retry? (You’ll be logged out automatically when you delete this but relog and relog out)