Every time I login into my world, every advancement I've made when I logged out was suddenly gone, which means I have to do all advancements again which is a huge time consumer. This seems to only affect the 1.16 version of the game since I haven't encountered it when I play Minecraft in older versions. Would be Appreciated if this was fixed. Cheers!
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galaxy_2alex
Avoma
This actually appears to be a duplicate of MC-187701, 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.
migrated
Please provide a screenshot of your world with the F3 debug screen enabled.