Issue Description:

When Chickens Mod is present, game suddenly crashes during I am running in the Nether dimension.
I then disabled Chickens Mod, and this issue is gone.

Steps to reproduce (important):

1. Install Chickens Mod, then modify chickens.json and main_chickens.cfg.
   My modified config files are attached below:
   https://gist.github.com/RisingInIris2017/413edc57e51a2ee6ede47a7c0d74560f
2. Randomly run or fly towards a direction.
3. After covering a few distance, game crashes.
4. Restart the game, and find that I am at the position where I am when game crashed.
5. Continue to randomly run or fly towards a direction.
6. After covering a few distance, game crashes.
7. Restart the game, and find that I am at the position where I am when game crashed.
8. Repeat running-crashing-restarting process, and it is always able to be reproduced.
9. Disable Chickens Mod by change its extension name from .jar to other string.
10. Randomly run or fly towards a direction, but game never crashes again.

What happens:

Game suddenly crashes when I am running in the Nether dimension.
Here are 3 crash-reports:
https://gist.github.com/RisingInIris2017/639d20f2fb20435718cda3cd34eca8e6

What you expected to happen:

Game should not crash.

Affected Versions (Do not use "latest"):

• Chickens: Chickens-6.1.0
• Minecraft: 1.12.2
• Forge: 14.23.5.2854