Similar to the item frame bug, all leads that I used to keep animals in place have despawned and when I try to place new ones on them they despawn as soon as I want to connect them to fences. Also when I right click with a lead on a horse minecraft ignores that I am holding the lead in my hand and I start riding the horse like I didnt had in the lead in hand to begin with. It does attach the lead to the horse though. I am sitting on the horse and having its lead in my hand at the same time.