SO, I had a villager with mending for only 9 emeralds, I bought over 20 books from it, so you can infer it was most certainly locked. Well turns it wasnt, it rerolled its trade for no reason. This has really ruined my mood today as that is a trade i will probably never get back.
MCPE-225583
Villager rerolling when locked in.
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filthy clanker