Villagers don't breed

In the snapshot 18w49a my villagers were breeding, but now with that same system in the snapshot 18w50a they won't breed at all. I was afk for 2 days but nothing happened, i think that can be a bug? Or is that system changed with the new skins, i could not found a message about that, so that is why i thought it is a message worth.  I use the latest java: 1.8.0-181 64 bit/2048 mb