Replying to @eFuse_Nolanova
We apologize for the inconvenience, but this is currently a known issue. The team is currently working on a fix that should fix the issue as soon as possible. Thank you for your patience while we work on the solution!

Mar 10, 2021 · 5:01 PM UTC

1
Replying to @MojangSupport
Update: After further testing with both old and new worlds, it seems the issue is that the update corrupted my main world in split screen. Other worlds work fine without any issues Hundreds of hours of work down the drain building that world. It’s honestly unacceptable.