I've made 3 comments in the past 2 days but none of them show up if I look at the home instance of the communities they're on. They're all on lemmy.world, but I see comments from other instances in the threads so I don't think the problem is on their end.
Mine just started federating again after 3 days of nothing. It's the second time mine have gone dark since 0.19 was released. I'm looking forward to a fix getting released for sure.
Same! After a while they do seem to federate. Conversely I often see comments from other people later as well. E.g. I comment on a post where I see no responses, 2 days later I can see there were a few people who posted before me.