Elytra texture is replaced by a bunch of items while holding any item your hand.

Put the summary of the bug you're having here

What I expected to happen was...:
I would see a normal elytra texture.

What actually happened was...:
The elytra texture was replaced by a bunch of random items.

Steps to Reproduce:
1. Log on to Minecraft, and go to singleplayer or multiplayer.
2. Put on an elytra and press F5
3. Get out any other item and hold it in your hand.