I may have found a bug that crashes the game.
Every time I die near at least 2 zombie pigman and my zombie player spawns they crash the game.
Here is the crash report
https://pastebin.com/XwEvaAjP

Looks like the still ongoing maaybe reliquary crash P3pp3rF1y/Reliquary#355

Can't quite reproduce in my zombie players / zombie awareness environment. I don't do any targetting overriding stuff so I don't see how it could be my mods at fault.

I might dig into this issue further to see if I can help though, hrmmm.

Thanks for the info, I'll keep my talks in those threads then, going to see if we could maybe fix this in forge itself.

I found what’s wrong but i am not a modder able to fix it.
The mod author from corail tombstones helped me locate the bug.
It is a problem with forge itself that causes mobs that have a revenge function to mess up. It was something in forge 2777 and up I think. But these versions and up are needed to run many other mods so many Modpack makers can’t downgrade. Here Corail31/tombstone_lite#42