I was playing on a realm updated to 1.16 and gathered some resources before logging off, but when i logged back in i was back where i started before the resource gathering. Then later me and my friends were exploring in the nether and conquered a bastion, then logged off and after we logged back on the world had reverted to before we even entered the bastion. We think that when no one is online, the realm reverts back to its last save.
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Avoma
This appears to be a duplicate of REALMS-4224, which hasn't yet been resolved. If you have any additional information to provide regarding this issue, feel free to comment on the parent ticket. If you feel that this issue is affecting you, feel free to vote for the duplicated ticket, to give Mojang a basic idea of how many people are impacted by the problem. Just to further inform you, this will not determine how quickly the bug gets handled or fixed.
9 July - Confirmed that this is an ongoing problem. My wife and I play on a small realm which has had rollbacks on an almost daily basis recently.