Here's where it gets interesting.

Any post I sent last night that was visible to users on other instances remains there.

I can't delete it, because I can't see it on my instance. Auto-delete won't delete it either, for the same reason.

In terms of people's ability to control their data, this is a problem. It affects all #Mastodon users.

It's also a problem Mastodon has known about since December 2022, when I sent them a suggested fix: https://github.com/mastodon/mastodon/issues/22154

Which they ignored, as usual.