Baby horses don't show feed button

When you attempt to feed a baby horse a golden carrot no feed button shows. I want the baby horse to grow quickly. The only way i'm able to do this is to hold down on the horse without hitting it.

Steps to reproduce

• Spawn a horse until you get a baby horse or find a naturally spawned baby horse.

• Feed the baby horse golden carrots or apples because you want the horse to grow quickly.

Observe that no "Feed" button is displayed.