Apparently version 1.0 of the WordPress ActivityPub plugin broke my lil’ “add-on plugin,” so I updated that. Also, “deletes” somehow stopped propagating, but that too has already been addressed in a fresh PR! Installed it locally and everything works as before.
I’ll write about these tweaks, and why I think they have value, later on. And then I may finally enable “native” ActivityPub support for this blog, too.