The new curse books (Curse of Vanishing and Binding) are not a part of the trades from the villagers, or if they do, are way too rare, as I was making a trading haul with all of the enchantments possible, and haven't come across with any of them yet, even though I must've changed the available trades of the librarians hundreds of times. Hope this gets fixed or at least becomes less rare so that I and other players can have a complete trading haul.