In response to the release of 1.16, I download my Realms world and deleted my DIM-1 to reset my nether. After-which I installed more datapacks. Then I backed up and loaded my world into 1.16. I then uploaded the world into Realms. After playing for around 5 minutes my Realms kicks me from my server stating, "Server Closed." When I head back into my world my progress for the past 5 minutes is reset.
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I have had the same issue, also accompanied by the occasional Null-0 message or Null Pointer Exception Error. Trying to reconnect to realms has resulted in intermittent blank screens, "game crashed while rendering screen" error, and "could not connect to realms: Read timed out" error
This appears to be a duplicate of REALMS-5953, 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.