I had several villagers that had been zombified and cured several times so their trade value of emeralds was down to 1 item per 1 emerald or 1 emerald per item. Started yesterday logged on to play and all my villagers have set back to what they would have been of they hadn't been zombified and cured.

Had created a new world with the new snapshot just before I had this issue on my survival world May be linked?