Lemmy can interact with Mastodon, it’s the other way around that’s bad. The point where the communication does not work is Mastodon content that isn’t posted to a community and doesn’t tag a community either. You can’t follow a user on Lemmy so these posts are not fetched at all. So some content on Mastodon can’t be seen on Lemmy but I believe all content from Lemmy can in principle be seen on Mastodon.
Lemmy can interact with Mastodon, it’s the other way around that’s bad. The point where the communication does not work is Mastodon content that isn’t posted to a community and doesn’t tag a community either. You can’t follow a user on Lemmy so these posts are not fetched at all. So some content on Mastodon can’t be seen on Lemmy but I believe all content from Lemmy can in principle be seen on Mastodon.