The bug
Horses sometimes get stuck on a ledge when falling down while trying to climb it. Only the player moves up, the horse stays on the lower level until you let go on the W key, at that point the horse moves back to where it should be.
Since this issue is more noticeable with fast horses, you can use the following command to summon one which should make reproducing this much easier.
/summon minecraft:horse ~1 ~ ~1 {Attributes:[{Name:"minecraft:generic.movement_speed",Base:0.7}],Tame:1b,SaddleItem:{id:"minecraft:saddle",Count:1b}}
Videos
Linked issues
is duplicated by 4
relates to 2
Attachments
Comments 11
Can confirm in 20w51a.
Can confirm in 21w06a.
Can confirm in 1.17. This can easily be seen and reproduced with fast horses.
Can confirm in 1.17.1.
Can confirm in 1.19.
Can confirm in 1.19.2. Since this issue is more noticeable with fast horses, you can use the following command to summon one which should make reproducing this much easier.
/summon minecraft:horse ~1 ~ ~1 {Attributes:[{Name:"minecraft:generic.movement_speed",Base:0.7}],Tame:1b,SaddleItem:{id:"minecraft:saddle",Count:1b}}

seems Fixed in 23w17a
While inconsistent and unreliable to reproduce, I did manage to confirm it in 24w14a:
[media]
I cannot reproduce this in 24w21b, likely because of the fix for MC-272075.
Can you still reproduce the issue?
Can confirm in 1.16-pre6, here's my recording:
[media]