I think I accidentally created a skinny horse glitch that became inheritable.

I play on PS5 so I had to use my phone to get a video.

Anyway, I’m currently living on an island among many islands, and I had to travel far to get a horse. I found an adult and a baby. I managed to get the baby on a boat and just dragged the adult along with a lead. It took so long to get home that the baby grew to adulthood while still in the boat. Maybe that is why this all happened.

Later I was building the jump and speed tester and saw the horse wander out through a single gate. I saddled it and rode it through the single gate a few times, then tried the same with the other. The other wasn’t able to pass. I bred them twice, and to my surprise one of the offspring inherited the ability.

Through more breeding and releasing horses of inferior stats, I now have a herd of 7 that all have this ability to pass through a one block gap. I tested it by making a single block wide tunnel with a 2 block high roof. I used a lead and they passed through no problem.

I’ve restarted the game several times and traveled away for the chunk to reload, and they still are able to pass through one block gaps. The only thing I haven’t tried is taking a horse off the chunk to see if they reset. Idk if this is a common glitch, but it’s my first time having it, and it’s pretty cool that it was passed down to the offspring.