So, I have read the other reports and decided to try it out. and so far on PC at least it shows that what they are saying is true Villagers are having started xp to lock their trades and profession even when coming from a zombie villager.
  Mods have been saying "That only shows the xp you will get." but the problem is that why would it show the exp your gonna get when you havent even selected a trade.
  When I tried to change the VIllager it just stays the same as if I already traded with it.

https://youtu.be/G5oB4BXilnM