Posts don't appear to propagate to other instances
So I'm noticing that I don't seem to get any engagement when I'm posting replies to posts generated on other instances. Just now I thought I'd go directly to a thread on lemmy.world to see if my comment was showing there but it isn't. Other non lemmy.world users are showing up.
Interestingly, my test messages to my account on sh.itjust.works from 6 days ago have successfully federated today. And also a test message I sent today.
I can't see the linked comment elsewhere, but I can see this one on sh.itjust.works and lemmy.dbzer0.com, though not lemmy.world (and also not lemmy.ml).
Hmmm...
Maybe, just maybe, it tried to retroactively federate everything that didn't successfully federate, and the amount of posts, comments, messages and votes somehow broke things. But that's just unlikely speculation.
Edit: Also, the instance was upgraded to 0.19.1-rc.2 instead of official 0.19.1 stable release, which is newer. I guess that was an accident.