Horses (and mules, probably donkeys as well), while in the passenger seat of the boat, do not seem to be turning around with the boat. This causes at certain directions the player's view to be completely blocked by the horses tail or behind.

Repro Steps:
1- Tame a horse & saddle it (I also have a iron horse armor on my horse, and a chest attached to my mule, in case it makes a difference)
2- Acquire a boat
3- Acquire a leash
4- Place the boat in water
5- Leash the horse, and drag it to the boat.
6- Unleash the horse
7- Get on to the boat
8- Row a bit, the turn the boat around slowly a full 360 degrees.
Expected: View is never obstructed.
Actual: The view is obstructed at certain angles when turning around. This doesn't change if boat is rowed in that direction.