When loading into a world, your advancements can be reset, removing all that progress.
For me, personally, I loaded into my hardcore world which was previously on 20w19a.
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galaxy_2alex
Arisa Bot
Thank you for your report!
We're resolving and linking this ticket forward as a duplicate of MC-187701, as that ticket contains more detailed information and/or has already been triaged by Mojang.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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migrated
Resolving to MC-183747, please provide more info there.