I created a survival world in the 20w1515a snapshot, now i have updated to 20w16a and checked stats and achievements and the stats were all at 0, and some of the achievements were gone.
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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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Please check if that's still an issue in the latest snapshot.