Expected Behavior

Carrying multiple animals with piggyback does not crash

Actual Behavior

The server hangs, then the watchdog kills it.

Steps to Reproduce

Despite multiple attempts, I have been unable to reproduce this, but I watched a player on my server do these steps:

1. Carry a jersey cow using Tinkers' piggybackpack.
2. Add a hen on top with another piggybackpack.
3. Sometimes it crashes then, other times it crashes when the piggybackpacks are taken off, which releases the animals.

I understand if you can't fix the issue due to the inconsistent repro, but please at least add more logging to diagnose the issue.

Version of Minecraft, version of Animania, Single Player or Server

Modpack: DD&SS 5.3
Forge: forge-1.12.2-14.23.5.2836-universal.jar
SpongeForge: spongeforge-1.12.2-2825-7.1.6.jar
Anamania: animania-1.12.2-1.6.2.jar
Tinker's construct: TConstruct-1.12.2-2.12.0.135.jar

Crash report

https://gist.github.com/bluelightning32/6c3e3adef5b7b45addffcf351370c89e

Debug log

https://gist.github.com/bluelightning32/eafa6d4e9aed880e6318d842492b5ee1

It could just be incompatible issue or piggybag problem from Tinker's construct. Suggesting resolving problem by contacting Tinker's Construct devs.

Of course, I would recommend using Carry On for this. It was built for exactly this purpose.

And also would recommend you reach out to TC modders.