TPing horse while riding the horse doesn't update

It only let me select 1.1.0.55 in the tracker, but it's the current release build that is effected.

Summary:
Teleporting a horse while a player is riding it does nothing. Once the player dismounts the horse, the horse teleports to where it should have from the command.

Impact:
There is no way to control moving the player when they're mounted and still keep them mounted.

Repro steps:
1. Create any world
2. /summon horse
3. Grow/Feed/Sit on horse until tamed
4. Put saddle on horse
5. /tp @e[type=horse] ~ ~ ~10
6. Note that nothing happens
7. Dismount the horse, and watch it appear 10 blocks away in the Z direction

Observed results:
See above

Expected results:
The horse should at the very least be teleported when the command is run. It is likely the horse is teleporting and it just isn't updating on the client side. Ideally, the horse should teleport when the command is run, and the player should be pulled with it and remain mounted.

Screenshots/Videos attached:
No