Recently started using the Realm with the 1.21.1 update and noticed two times now when I've been disconnected from the Realm and when I logged back on it back rolled me an hour at least each time. On one occasion I've noticed an item duplicated while another few items vanished, I think the vanishing items is because perhaps the game thought I never picked them up so they de-spawned when in reality I did but the back roll undid this somehow.