I used chameleon skin on aquamirae armor 2 times, after which the game crashed
I used ColdSweat-2.3-b03d.jar

crash-2024-05-18_23.41.06-client.txt

crash-2024-05-19_14.07.26-server.txt

I believe this should be fixed in the next version. I'll leave this open until it's confirmed

I'm using 2.3-b03e on 1.20.1 and it crashes even now; I could put one chameleon skin on a Refined Obsidian Chestplate from Mekanism Tools before it crashed. The rest of the armor pieces are fine.
Edit: here's the crash log crashlog.txt

Alright, well in that case, I have one more fix that should avoid this issue happening altogether. It'll be out very soon.

Fixed in 2.3-b03f :)

Awesome! I'll be closing this issue, then.