I'm noticing that new posts, comments and especially updates to posts and comments and votes are not pushed to the origin of communities which lemmy.world users have subscribed to. Or at least it takes many (>> 10) hours.
Just pick a random community that is not local to lemmy.world and compare the local copy with the origin. I would be surprised, if you don't find tons of comments from lemmy.world users which have not been pushed yet.
The result is a lemmy.world bubble in which lemmy.world users see posts and comments from each other but nobody else does.
And the thing is that I don't find how to repare it. I looked if the instances were defederated, but they are not. Lemmy.world respond and send data fast, and the others instances too, except if it's between lemmy.world and others. I tried with a alternative account to post on lemmy.ca from lemmy.ml and it didn't have delay. I just don't understand at all
Edit : I have a hypothetis. Lemmy.world is still on 0.17 but the other instances are on 0.18. Maybe it have more consequence that we would think not being on the same version