Whenever a villager spawns in a village or igloo basement, or is cured by a zombie villager, the villager is given a small amount of XP towards his trades. This means that said villager is not able to change profession, as the game thinks you already traded with them at that point in time and will not allow you to change the profession using work station blocks.
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Thank you for your report!
We're actually already tracking this issue at MCPE-48712, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature, to see if the issue has already been mentioned.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki
Thank you for your report!
We're actually already tracking this issue at MCPE-48712, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature, to see if the issue has already been mentioned.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki