Put the summary of the bug you're having here
What I expected to happen was...:
I expected to be able to play on a Caves of Chaos preset survival world
What actually happened was...:
World generated with some effort, game crashed after playing for a few minutes
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...generate caves of chaos world
3. ...set vision to 16 chunks
4....start playing, maybe for 5 minutes max
Incomplete without a crash report. Please attach it so the issue can be diagnosed.