Fist bugs out when taking off with an elytra

When you take off with an elytra while facing southeast and holding nothing, this bug happens.

Discovered on 1.13.0

How to reproduce: Wear an elytra, and fly down while facing southeast and holding nothing in your main hand.

 

I recorded a video on the bug: https://www.youtube.com/watch?v=DgtPhwKiAD4