I Cant trade with my Master Farmer Villager (that disappeared :()

I was in a world and I went to my Master,Farmer Villager.I try to trade him and when the trading menu opens...IT CLOSED INMEADITLY! I had the Villager since around 1.14.3 prerelease 2 and he dissapeared a few minutes later. And I CANNOT recreate the Bug. It does not work with the Fisherman or the Librarian and most likely others.