When jumping with a horse while falling off a block, the horse jump animation will still play.
Expected:
Jump animation does not play unless the horse actually jumps up.
MC-256464
If a horse is not on the ground while the player jumps, it will still play the jump animation
Open
4
(Unassigned)
Confirmed
Gameplay
Low
Mob behaviour
1.19.2, 22w42a, 1.20 Release Candidate 1, 1.20, 1.21.4
Retrieved
The same is also the case for the sound that plays when jumping, see MC-205561.