This works for all versions 1.16.10 or later.
I found that the horses that were tamed before 1.16.10 are "super horses" (cannot take damage). offspring of said superhorses do not have this characteristic. Superhorses sometimes appear with up to 200 health.
This may be hard to recreate as the horses that are affected are from an earlier version.
recreation:
1: get a device on 1.16.0 or before
2: tame a horse
3: update world/device to 1.16.10
4: hit the horse with a fire aspect sword, then mount it to observer its health
Observed results:
horse tamed before 1.16.10 does not take damage by any means {lava, ravines, harming II)
Expected Results:
The burning horse takes damage.
Update:
Horses that are being ridden no longer take fall damage, no hurt sound or red flashing.
EDIT 2022
Bug is still present in versions 1.17, 1.18, 1.19.
Since I am on mobile it is difficult for me to upload a world. I have provided world.dat and a link to the world files. Do excuse the strange name.
LINK TO FILES:
Linked issues
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Comments 6
I have updated the steps and expected results in the description to match the videos that were included with the report.
Horses taking fall damage while being ridden is a different issue now tracked at MCPE-107031.
In the future, please update the Affected Version/s field instead of adding new text to the description to tell us that the bug still occurs.
Resolving temporarily as Awaiting Response. Could you please attach the affected World to this ticket? If it exceeds the file size limit, you can upload it elsewhere and link it here.
The .zip file linked in the description does not contain the entire world save. It only contains the /db subfolder. Please zip the entire contents of the world save folder and then share, or use the Export button in the world save options screen inside Minecraft to export a .mcworld file, and then share that.
Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
For any account or purchasing related issues, please contact Minecraft Customer Support directly, as we cannot assist with those here at the bug tracker.
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try taking the diamond armour off the horse the n try it