Reset Achievements & Old Treasure Maps became blank

Between yesterday and today (11/11/2022 & 11/12/2022) something strange happened. One of my old Single Player Worlds that I began to play again weeks ago just reset all my achievements that I had already unlocked and at the very least two Buried Treasure maps that I had on display in my house became blank. These were, thankfully, maps I already investigated and took the treasures from; problem is, I was saving these to compare to new ones in case I had duplicates. New maps that I found are fine, it is only the maps I already had that seem to be affected. Plus I have no idea what happened to my achievements, truly. Even the starter ones are gone ('stone age', 'isn't it iron pick', 'the parrots and the bats', etc).