@ShadowJonathanOne bug I already found:
Moves (account migrations) could fail for observing akkoma instances if the migrated-to user has set their "also known as" (aliases) for that user less than 24 hours ago, *and* that akkoma instance has fetched and cached that user less than 24 hours ago. It doesn't properly evict cache when processing the move activity.
With that, a move activity would be a dud, and not move over follows from that instance.
@ShadowJonathan@tech.lgbtSo the advice I can give for anyone already is to wait exactly 24 hours between setting their alias on their new instance, and pressing "migrate" on their old instance.