Bred horses with known amount of hearts are no longer retaining/consistently having the same amount since latest update

I have been breeding horses for over a month, trying to get the perfect horse (fastest, can jump over 5 1/2 blocks and have 15 hearts).

I’ve been marking the best with armour:
- diamond: fastest, highest jump, 15 hearts
- gold: fastest, highest jump, 14 hearts

I have one horse that was perfect: marked diamond, and two near-perfect: marked gold. But since the latest hotfix/update, their hearts have frustratingly changed numerous times! Yesterday my diamond one and one of my gold ones had 13 hearts. Then today diamond had 14 hearts and both gold are now 13 hearts. When checking back up copies of my world, they are showing constantly different amount of hearts there as well.

I saved and quit to begin reporting this bug, I then reopen my most current copy of the world to create the screenshots and the full 15 hearts have returned to all three horses! Before saving images, I reopened an old copy again, then returned to the latest copy and diamond is back to 14 hearts, and both gold are 13 hearts this time.

*had to pause my game for a long phone call* Then I rode away on one of them to the nearest chunk from where they are fenced in and returned to the chunk, suddenly they all have 15 hearts again when I consecutively sit on each one to check these three again. I thought the hearts were being altered each time I saved and quit, but just discovered they were changing when chunks are being loaded without closing the world.

My world is not connected to a realm, no one else has access to my world (I’m a sole player), and I do not switch which horse has what armour once it’s been determined a perfect or near-perfect horse - even after their hearts have begun changing since the latest update.

If hearts are not consistently being the same on a single horse when breeding, how am I supposed to know it’s actual amount of hearts and if it’s going to be consistent or erratic once they become an adult?

I had also reported MCPE-221734 a breeding bug of empty hearts that won’t fill when a newly tamed horse from breeding is fed and it’s empty hearts are permanently disappearing but that has been closed as “resolved” because it’s being tracked in the reopened: MCPE-165899, I’m unsure if this is a related bug or a completely separate bug to do with the horses because the difference is the hearts I’m reporting in this log are not permanently disappearing compared to a newly raised bred horse.