I tried updating the mod to 0.0.17c in this custom modpack. (version 2.0.4): https://www.curseforge.com/minecraft/modpacks/dragonspire-reborn-techno-edition
anyway as soon as I tried to join the server the client would crash. Crash logs below.
crash-2021-07-17_15.42.44-client.txt
crash-2021-07-17_15.45.52-client.txt

Same issue here; occurs with all biped mobs (zombies, husks, skeletons, players) when trying to wear armor. Narrowed down offending mod to this one with testing.

Don't know if this is an incompatibility with another mod, so I've attached a crash log.
crash-2021-07-18_12.36.21-client.txt
Error resolved clientside by removing CPM from load order.

EDIT: Reverted from v0.0.17c to v0.0.16b. This issue isn't in 16b. Might have to do with the edition of editable armor in 17a.

I hate to be one of those guys that just say "bump" but I can confirm I'm another player dealing with this issue after version 17, always when trying to render clothing items on mobs.

Bump ~ Bump >_>
crash-2021-07-20_12.05.28-client.txt

Happened to me only on a server, worked fine in singleplayer