i joined my singleplayer world and all my advancements data was gone.As soon as i got in basic advancements apeared which i had stuff on me to complete.When this happened i joined the serrver last time 10 mins ago and im sure nothing changed to the words folder.
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Did you at any point open the world in 1.15.2 again after having opened it in 1.16?

no its was made and has been in 1.16.1 since it got came out

Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response - this does not mean the report is not valid, we just need more information to verify it.
While the lag occurs, please run /debug start
, wait a while and then run /debug stop
in order to create a debug profile. Afterwards, run /debug report
.
If you do not have the permission to run these commands, open your world to LAN and enable cheats. If you're on a server, make sure that you're a server operator in order to execute these commands.
Then, please attach the profile results found in [minecraft/debug/profile-results-<DATE>.txt|https://minecrafthopper.net/help/guides/finding-minecraft-data-folder]
, as well as the debug report found in [minecraft/debug/debug-report-<DATE>.zip|https://minecrafthopper.net/help/guides/finding-minecraft-data-folder]
here.
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This actually appears to be a duplicate of MC-187701,Β which hasn't yet been resolved.Β 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.