One time I opened up my world and found several chunk areas were missing only in my general area and everything inside the chunk would go missing, but the weirdest part was that that the chunk would be newly generated land
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Please attach the game output logs from when this issue happened to you, as well as the log from when you last played the world before that. You can find the output logs in .minecraft/logs
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This ticket has been merged into MC-161823.