I discovered a horse floating one block above the ground. It was floating above a regular grass plant (minecraft:grass). Next to it was its two foals. Upon attempting to ride the floating horse, the horse stopped floating and fell to the ground. There is not a single command block or function/datapack that could be giving a horse the NoGravity NBT tag, repetitively teleporting a horse to one specific block, or placing a barrier block below it. I did not interact with the horse in any way before I noticed it floating. I did, however, see it not floating when I loaded the chunk for the first time, but upon wandering around more and coming back, it was floating.
I have been around many horses in the snapshot and have never noticed something like this. Perhaps it is from the new collision mechanics, which is very likely, for I saw the horse's foals near it and sometimes pushing it.
Recreating
I don't know how to recreate it. It simply happened, and I assume it had something to do with chunk loading. I apologize if this should not be reported because it is too hard to reproduce.
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I've discovered this bug is still present on 20w22a, also not dependent on foals being nearby.
@ Spawn of seed: -322484836467412267
Fresh map, no mods, creative mode. Right at spawn, on a small hill, horse was @ 132 ~ 32
The one horse floated 1 block above the ground, even moved around a little staying 1 block above the block it was on.... (pictures attached)
I re-created the map 4 times, each time, same thing....
Unfortunately, it was inconsistent. Sometimes I recreated the map, and the horse was NOT floating..... This makes me thing it depends on which block it spawns...
NOTE: If the horse walks around, it drops back down to ground beneath it.
Confirmed bug in snapshot 1.15 Pre-release 1.
This bug doesn't seem to depend on horses being close to foals, however.
Reproducible in creative with no apparent reason as to why it happens. Summon several horses in a small and fenced area, move around between them and the behavior can most likely be reproduced again.