I went to a different singleplayer world to test something and when I came back to my main survival world, I was suffocating inside a chunk from a mountain that had been moved. I switched to creative to see that the area around me was mixed chunks from other areas around me. The affect existed underground, as well and duplicated a monster spawner but turning the duplicate spawner into a pig spawner. Images below.
Sidenote-This is my first ever bug report so Im not sure if I've done everything correctly, but thanks for reading regardless.
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The one thing you forgot to do was search if the bug has already been reported.
violine1101
Thank you for your report!
We're actually already tracking this issue in MC-161823, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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