The other day my unsorted category went missing, I asked about it in discord and someone suggested adding an item to my wishlist, which fixed it. Today it is gone again and adding an item is not bringing it back.

Edit to add: It popped back up again, but it's weird it keeps going away. lol

I just noticed that mine is also missing. I added something to it and went to go change it to the proper category I want it in and it's not there.