Z-fighting spyglass and hand (with slim arm size)

Summary:
In the hand with the spyglass, z-fighting occurs between the spyglass and the hand.
This only happens with skins with slim arms!

Steps to reproduce:

1. Create a skin with slim arms.
2. Take a spyglass in your hand.
3. Look at the hand from the third person.

Observed results:
Z-fighting occurs between the spyglass and the hand.

Expected results:
There shouldn't be a z-fighting.

Image: