How do Horses work?

[rednax100v2]

I've got a loop that teleports a horse to an airborne location every tick, as well as displays a particle at the location of the horse.
It works. Like it should.

I then tame the horse, give it a saddle, and click the horse. The horse immediately falls and takes fall damage despite having levitation 0 and being teleported on loop. The particle I added earlier that displays based on the horse's position is still airborne, despite me being on the horse and below it. If you get far enough away it'll teleport you back and you take fall damage again.

As soon as you dismount the horse teleport backs.

So
Despite being teleported every tick, and having levitation 0, you and your horse can indeed die of fall damage.

Pigs are fine tho they work as intended

 

[ARMcPro]

It's because of how horses are coded, when you mount them, they don't really "exist" because they are now counted from the Player Entity family and they move client side (player side) instead of server side just like Players