When you hit a horse, donkey, llama or mule spawned from /summon or a spawn egg for the first time, numerous damage heart particles will appear that do properly represent the damage the entity took.
Steps to Reproduce:
Summon a horse, donkey, llama or mule
Hit the entity
→ ❌ Multiple damage hearts appearHit the entity again
→ ✔ No damage heart appears
Expected Result:
The damage hearts would properly reflect how much damage the entity took.
Screenshots:
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Are you doing a full hit, or a flick hit? By flick hit I mean clicking fast once. Damage can be a bit buggy regarding the newer versions, so that is why it may vary depending on click.
One note:
As the other related issues mention, this behavior is due to the fact that horses spawned into the world with commands or spawn eggs are given a health value of 53. After getting hit, the health is clipped to 25 (the expected max for a horse). This is why you see all the particles, because technically the player is doing 20 or so damage all at once.
Requesting ownership of this issue as the original poster has not been active in 3 years.
Can you provide a screenshot with the debug screen enabled (F3)