In some cases when I post a comment to a topic on a different instance, the comment will seemingly just disappear into thin air. Posting and commenting to the Lemmy Support community seems to work mostly fine, even though it is on lemmy.ml while my account is on lemmy.world. Any comments I tried to make on feddit.de just plain disappeared, though, no trace of them anywhere, not in my profile, not in the discussion thread, not even on the actual feddit.de instance.

Any idea what's going wrong here?