When putting an entity into the cage of the Steve's Carts mod, the game crashes

Expected Behavior

The Mob should be trapped in the cage and not crash the game

Current Behavior

The mob becomes trapped inside the cage then the game crashes and whenever you try to reconnect the game crashed as soon as its loaded.

Possible Solution

¯_(ツ)_/¯

Steps to Reproduce

1. Create a cart from the steves cart mod (The one I used was reinforced hull, with an advanced tank, internal tank, cage and a solar engine).
2. Place a mob near the cage.
   3.Activate the pickup
   4.Crash.

Log

https://gist.github.com/TheSamFisher/675168e7727f94394472a98900ad1c06

Detailed Description

¯_(ツ)_/¯

Please report to Mod Dev Github.

Not a pack issue.

Thanks.