Please try to comment and post things now, and see if they federate again.
Hopefully you see your activity instantly federated. I have tried making comments both to instances running Lemmy 0.19.1 and 0.18.5 and they all federate like they should.
Hope you have the same experience! 🥳
It’s not like they’re private anyways, but sure:
https://lemmy.today/post/4778593 https://lemmy.today/post/4786719
Neither of these seems to be visible on Lemmy.world