Hey there! I've posted a fix now that ratings are over and uploads are unlocked.
Let me know if this works for you guys now! :)
Oof, this is a difficult one to debug!
I think it's an issue with how I'm preparing the surfaces for use with the palette swapping shader.
I've just posted another updated version with an attempted fix, let me know if this loads for you now and thank you kindly for all your help identifying these issues <3