the mod "3D skin layers" a popular mod that make the second layer of a Minecraft skin voxelated (3D) is not compatible with this mod, what happens essentially is when the players opacity start decrease the 3D parts of the skin dose not seclude to the same effect, the following screenshots will help to describe the bug much better

see there the 3D skin parts have no change

they only vanish when they get too close

and it seems to happen for armour and items too

this will hopefully come in 1.1, which will be soon™. I'm aiming to add this along with proper fading for capes and armor.

if you need any help im happy to be in service