The Realm server doesn't save progress. we all log off for about 5 minutes and it reset again. When we're online we don't have any issues.
We think it might have something to do when we generate new nether terrain.
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Same thing is happening with my girlfriends realm.
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I am running a realm server for my Boyfriend and friends and they had hours worth of projects and its not saving anything when everyone gets off. It restarts at the last point of when I uploaded the world.
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.
same thing happens on our realm, when no one's online it reverts back to the last save