Weird shadows on the player's arms when using bendy-lib

[ZigyTheBird]

Steps to reproduce

• Turn on shaders... obviously.
• Start a player animation that uses bends from bendy-lib usually done via Emotecraft.
• See the very unappealing shadows on the player's arms as shown in the screenshot.

Screenshots

Log output

No response

Minecraft Version

1.21.1

Iris Version

1.8.1+1.21.1-neoforge

Operating System

Windows 11

What is your GPU?

rx 7600xt

Additional context

This issue is solved by turning off real-time shadows, but that isn't exactly ideal.
I would work on writing a compatibility patch myself if I knew where to start.
Any hints on how I could make a fix for this would be appreciated. :)