Sleeping in bed while riding horse causes player to lay in wrong position

When riding a horse or donkey, right clicking on a bed to sleep causes the player to lay on the ground beside the horse/donkey instead of on the bed.

Steps to Reproduce:

1. Ride a tamed horse equipped with a saddle.

2. While on the horse, right click a bed to go to sleep.

Observed Results:
If in singleplayer, the player appears to lie down on the ground beside the animal instead of on the bed. If in multiplayer, other players will also see the player sleeping on the ground.

Expected Results: Player should correctly dismount from the horse and lie on the bed.{*}{*}