This crash seems to involve 3 mods, but I believe the main cause is this mod. I have on an Arkenplate from Soulslike (0.9.9.3), but when I try to use Cosmetic Armour (1.4.20 to make it appear as a Wither Skeleton Chestplate from Immersive Armour (1.5.0), the following crash occurs:

crash-2023-08-11_20.27.36-client.txt
crash-2023-08-11_20.36.39-client.txt

The crashes seem to be the same in nature. Removing CA then removing the skeleton chestplate from the slot fixes the issue

Try this jar for 1.19 https://github.com/TeamChikken/cosmetic-armor-CHKNFork-1.19.2/releases/tag/1.19
CleverNucleus made this fix and it seems to work from my testing.