Minecraft 1.14 Villager Trade Bug?

I'm in a village with villagers. Could trade with everyone initially. But all of a sudden I can't do it with 2. If I right-click, nothing happens. If I spam right click, the shop opens for a millisecond, but disappears again. But if I put an item before the villager in front of him what he would buy, he shows me the emerald with his arms. Is it a bug or did I do something wrong?

Is it the villagers who act? Since the 1.14 are no longer all dealers. Otherwise, I do not know.

Yes, there are villagers, one is a farmer and the other is a librarian. As I said, see the shop so very short