Put the summary of the bug you're having here
What I expected to happen was...:
Minecraft would work properly.
What actually happened was...:
Minecraft lags and crashes spontaneously while I am building with redstone near the top of the world, often in creative mode, after I had started a server using the Open LAN feature.
Steps to Reproduce:
Haven't been able to reproduce in other worlds.
- duplicates
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MC-502 IllegalStateException::Entity is already tracked!
- Resolved