Shield arm position is incorrect while in a boat

Steps to reproduce:

1. Take a shield with hand/off-hand
2. Ride in a boat
3. Put the game in third person
4. Hold the right button and look around

Demonstration: https://1drv.ms/v/s!AlvnIukafxYfg59I5hqLLhVGZGVT9A?e=1N7plw