Bug Description
Shai has a unique "awakening" weapon which you refuse to call "awakening" weapon.
She is unable to put a skin on her "Sol" (Talent/Weapon) Appearance Slot:
Contrary to all other classes, Shai is unable to obtain 10% Durability Reduction Resistance through an awakening weapon skin.

Possible Solution

I agree with this suggestion.
I agree with this suggestion.
It is a bug, not a suggestion.
They did fix Shai being able to obtain the set bonus with just 7 pieces instead of 8.
But she does not get all of the item effects that should come with being able to equip all the Appearance items.