@pfefferle I fear the answer is "No", but...
Is there any way to make a #Mastodon instance forget about posts from a Wordpress blog running your #ActivityPub plugin, if those posts are already deleted on the blog?
Apparently, when I tested some months ago, deletes weren't propagated properly, and now all those test posts linger on the instance of the account I followed my blog with. I wouldn't want actual blog followers to see the posts later.