I bred two of my adult horses by feeding them both golden apples while in a closed area (fenced area) and they did not enter love mode. They nuzzled with each other shortly after, but there is no baby. I waited 10 minutes and there wasn't a baby. There was another adult horse in the fencing but it wasn't close to the two horses, This is a screenshot of the pen after a couple of minutes and still nothing. I bred the black one with the one next to it to avoid confusion with feeding.

I read through the tickets and I think it isn't a configured world. This is my 3rd time playing minecraft and I created this realm for me and my friends.