Normally, having an item in the off hand causes the left arm to be visible in the first person view.

If the "Feel The Nether" skin is equipped, however, the left arm is never visible.

I've confirmed that changing to any other skin restores the left arm. I've also confirmed that the left arm is still drawn in the character inventory screen. The only other character appearance item I'm wearing in the attached screenshot is a shirt.

Steps:

1. Equip the "Feel The Nether" skin (unlocked by the nether portal building achievement)
2. Equip something in the off-hand slot.

Expected: Left hand rendered in first person view.

Actual: No left hand visible in first person view.