Someone on Reddit mentioned that there was some kind of sync issue with Lemmy.ml and this sub on fedia.io. Let’s see if this thread moves across instances.
EDIT: I have noticed that several instances are slow to sync by almost an hour or longer. I think this is something to do with a bug in LemmyNet.
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It’s probably not restricted to one sub/community. But it’s worth testing since it interferes with cross communication.