Unknownreported this bug
The villagers that I put in the "Vanilla" section so that they are automatically changed for the ones I want, every time there is a /mm reload or a reset itself, they get bugged and you cannot trade with them. (I apologize in advance because my English is so bad)
That is to say, at the beginning they do what a common, normal villager does, trading as always and everything is the same as a common villager, but when I reset the plugin or the server they get bugs and go to 0hp and cannot be traded.