In the picture, the villager on the left is the only one previously traded with. The space under the cobble block is was the place of a lecturn and was the only lecturn in the room. Having said this, the lecturn has been removed and the villager on the right has not changed jobs.
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I changed the rail it was on to a flat one and it fixed? Idk, weird
Thank you for your report!
We're actually already tracking this issue in MC-150806, so I resolved and linked 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 in the future to see if the issue has already been reported.
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