Meta announced that users on Threads will be able to see fediverse replies on other posts besides their own. In addition, posts that originated through the Threads API, like those created via third-party apps and scheduling services, will now be syndicated to the fediverse.
Because right now the Threads federation is still pretty one sided, the Fediverse users can reply to the Threads posts, but the Threads users can’t see the Fediverse posts, only replies
And with how Lemmy works, you can’t reply to the microblogging accounts, you can’t reply to Mastodon’s posts neither, so you can’t get your replies federated
That doesn’t seem right. I remember responding to a few mastodon threads from lemmy and I was able to see my reply on the other end.