Mirror (Red Nether Brick) Only Shows Arm

When playing the  "Color, Light and Shadow" world my main arm (The one used for hitting or holding objects) was displayed in the mirror (AKA: Red Nether Brick) while the rest of my skin was not displayed at all. The arm moved with and performed the same actions. When I chose a different perspective (Third person) I could see my whole body, but switching back I could again only see my arm.