If you're using Mlem and you see no posts under Subscribed
It looks like when Lemmy is updated, you have to sign out of your account on mlem and then sign back in.
In the app, go back until you see your account listed. Then, swipe it left and it deletes. Once you re-add it, it works again. The way to log out or delete an account in mlem isn't very intuitive, or at least it wasn't for me.
Thanks for highlighting this, it does sound very counter-intuitive!
It also sounds like frequent updates are a pain in the ass for mobile users, I hope Lemmy stabilizes to a point where we don't have to update every other day.