The Bug

This may be WAI, or this might be an oversight. 
Vex's arms are slightly thicker than the Allays, which is intentional. However, they are positioned in such a way that they are too high, causing the arms to clip through the new Vex model's head.

This also makes it look like the Vex's arms come out of its head.

Compared to the allay, the arms are positioned in a way to where it looks like they come out of its torso, and never significantly clip through its head, if ever.

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Steps to reproduce:

1. Summon a Vex and Allay next to each other with no AI
2. Observe how the Allays arms, while thinner, don't clip through its head
3. Observe how the Vex's arms clip through its head and even seem to come out of its head, like the arm is attached to its cheek