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I would like to inform you that in my world and also in some Realms that I have played, the villagers artificially generated, that is, using a reproduction system, some can learn professions and others can not. Also another bug in relation to it is of villagers who can learn and then simply can not change profession, even without having done any negotiation with itself.
Thank you in advance for correcting this problem as it is disrupting my experience.
      Tank You.