Hi !
So, I was wondering how big is the cave where I am and suddently the game crashed.
Here the crash report, if anyone can help me. Thanks !
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Also, was your world created in 21w43a, or was it created in an older version and then upgraded to 21w43a?

Here the world file, created in the 21w43a version of Minecraft
https://mega.nz/file/FsoGwQDb#HcVZEVMBaDoKzFt2mFiyrVwCmacQv0artWU6mVzgu74

I opened the world you uploaded in 21w43a, used "Open to LAN" to enable cheats, and then looked around your world. Nearby, there was an obvious chunk border:
[media]
Thus, this world was not created in 21w43a; it was upgraded from an older version. Generating a new world with the same seed in 21w43a has the chunks where you were when the crash happened look completely different. Furthermore, the old chunks in the world you uploaded contain dripstone caves, so this world was upgraded from a 1.18 snapshot to 21w43a. Upgrading from one snapshot to another is not supported; only upgrading from a full release is supported. The crash report you uploaded mentions "datafixers", so this crash appears to be caused by upgrading from one snapshot to another. Unfortunately, this report is invalid.
Resolved as a duplicate of MC-241956; same stack trace.
We do not have enough information to find the cause of this issue.
Please attach the affected (zipped) world file. If the file size is too large, please upload it somewhere else and then link to it here.
This issue is being temporarily closed as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.
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