Obviously not every mod is going to work with each other so I don't mean to be annoying by reporting another.
However, this mod doesn't seem to do anything similar to yours so I found the conflict strange and thought I should post it.

The mod Artifacts adds some Trinket accessories: https://www.curseforge.com/minecraft/mc-mods/artifacts-fabric

Running it alongside PlayerEx causes world generation to become unresponsive and crash the game. The only mods being used are Artifacts (and Trinkets, as its a dependency) as well as PlayerEx and FabricAPI. I've attached a crash log from regular MC and Not Enough Crashes.

regularcrash.txt
notenoughcrashes.txt

Let me know if you think I should post this on the Artifacts github.

Hi there,
Yeah this is a weird one; there's nothing in either of these mods that effects world gen. Thanks for sending the logs, I'll look into it asap.

Fixed with v2.0.2 (although some weird interactions remain with, for example, steadfast slippers - that give 100% knockback resistance - no more crashes though, hopefully).