Second meshgroup will not import into game or S4S. (SOLVED)

I am trying to make a CAS hat with transparency, but unlike the opaque parts, the second part with the transparency will not import despite following countless threads.


Package file

Blend file



Misc Info:


1. S4S version: 3.2.0.3 (Star)
2. Blender version: 3.3.2
3. What I would like to be fixed: I'd like for the second meshpart to show up.
Threads I've followed: 1. 2.



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This is how it's supposed to look like:



(The light grey part of the helmet is the transparent part.)



And this is how it looks like in CAS and in-game:



(S4S preview)



(In-game)




Thank you in advance for whoever possibly ends up helping!