Rimu@kemonine Yes, a known issue. While Lemmy and Mastodon both use #ActivityPub, they use it differently enough to cause a lot of problems.
https://lemmyverse.net/ can help you choose an instance.
Mbin does a better job of integrating both Mastodon and Lemmy content. https://fedia.io/ is an Mbin instance.
Also I've been building a Lemmy alternative which you can try at https://piefed.social
All GNU social JP content and data are available under the