Horses, donkeys are missing the LoveCause nbt data.

How to reproduce:

1. Breed, spawn, summon, or find a horse or donkey

2. Check for LoveCause nbt. You can use the command /data get entity @e[limit=1, type=minecraft:horse] LoveCause OR feed a golden carrot, golden apple, or enchanted golden apple to a horse or donkey

Observed results:

When command is run, Found no elements matching LoveCause appears in chat. When fed, no love heart particles appear, and the horse or donkey will not breed with any other horses or donkeys that were also fed, even if that horse or donkey had love heart particles appear around it.

Expected results:

When command is run, Horse has the following entity data: [I; -678234184, -1490858420, -1680735749, -732944783] appears in chat. When fed, love heart particles ahould appear around the mob, and it will breed with any other horse or donkey nearby that also had love heart particles appear around it.