Additional information from MCPE-151214:
The health display of a mob you're riding occasionally hides the mob's max health. However, it corrects itself upon the mount's health being updated (being healed or taking damage). This is most noticeable on striders and pigs since they do not heal naturally, but it can be caught on horses.
To replicate:
Get a mob, preferably a strider or pig.
Mount it and take note of its HP
Now deal any amount of damage it, just don't kill it.
Move far enough away from the mob so that it unloads.
Go back to the mob and mount it.
Expected Result:
You see your mob's health, that it has taken damage and is not at full health.
Actual Result:
You won't see the empty, or half-hearts of your mount, so it'll look like your mount is at full health.
A horse will show its max hp as its health when you saved and quit the world:
Steps to reproduce:
Get a horse
Damage a horse
Save a quit
Reload
Notice the change in apparent max hp
Linked issues
is duplicated by 7
MCPE-63065
When horses get damaged. They will show inaccurate hearts.
Resolved
MCPE-135514
Horse Hearts are different each game
Resolved
MCPE-140890
Can not heal my mule.
Resolved
MCPE-151214
Health display of mounts sometimes displays an incorrect number of hearts when the mount has taken damage
Resolved
MCPE-173657
Max Health Bug on Horses
Resolved
relates to 2
Attachments
Comments 7
Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response
Is this still an issue in the latest version? If so, can you please add it to the affected versions (or mention it if you are not the reporter).
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This is still an issue. Happens when a damaged horse's chunk is unloaded. I also attached some more image (hors2 and hors3) demonstrating how the health updates after the horse takes damage)
Jacob Holmes: Since you are the reporter on this ticket you should update the Affected Version/s field yourself. It is not necessary or helpful to add comments for affected versions.
Idk if this is the same thing, but baby horses from breeding when grown, their max hp shifts. It will be one number of hearts then a bit later they either have an extra heart or damaged hearts never regenerate.
I experienced this with llamas in 1.12-1.13.