I logged in at around 6 local time and started playing. I got off and on once or twice. Around ten I logged back in and the world was in the state it was in when I started. All items gained since then were lost and the structure I was working on reverted. The owner of the realm experienced the same thing.
The only thing I can think to add is that in the previous instances where I logged off and on again the owner was also on the server. The bug occurred when I logged back into an empty server, perhaps it was overwriting the current state with a backup?
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Avoma
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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.