Cannot mount horse

When I attempt to mount a horse, instead of mounting the horse like normal, my rotation was set to that of the horse, and I stayed in the same place. After trying this multiple times, I still have been unable to mount the horse. The horse was a baby that I used sugar on to accelerate growth. Upon using 1 piece of sugar, the baby grew up even though it was only a few seconds old. Upon re-logging, the horse was a child again.

Image 1: The horse I grew up
Image 2: Upon right-clicking, my veiw was rotated
Image 3: ^^^
Image 4: The horse's parent.
Image 5: I am able to ride the parent horse like normal.
Image 6: The horse is a baby again.

What I expected to happen was
I expected to be able to mount the horse like normal.

What actually happened was
I did not mount the horse and my point of view was rotated.

Steps to reproduce
1. Create new world
2. Find a baby horse
3. Use sugar to make it grow up
4. Attempting to ride the newly-grown horse will yield the results above.
5. Re-oppening the world will cause the horse to become a baby.