The Pointy Ears paid cosmetic is not rendering correctly

The “pointy ears” cosmetic item is rendering incorrectly when the player looks up and down. Specifically, the ears are becoming dark when the player looks up, and bright when they look down, when viewing the character from their front. It appears that when the game has inverted how it renders brightness and shadow on the character model’s face when it comes to the ears.

Expected Behavior: The ear cosmetic renders in-line with the rest of the character face.

 
Current Behavior: The ear cosmetic is dark when the face is light, and vis versa. 

To Replicate: Equip the pointy ear cosmetic. Enter a game. Switch to third person, with the player model looking at the camera. Look up and down. 

This issue affects both the current release and current beta.