I had two villagers, a master farmer and a novice librarian. i had traded with both, so their trades were locked.
they got turned into zombie villagers, so i cured them. when they came back they still had the same trades and levels, but all their trades except the potato/carrot novice trades from the farmer cost exactly 1 emerald or 1 of the item they give an emerald for.
So, I have bookshelves for 1 emerald, and i can sell books for 1 emerald. infinite emeralds. Mending book is 1 emerald and a book. I can sell 1 melon for 1 emerald. All of their trades except carrot/potato are like this.
I tried relogging, to see if it was a visual bug, it was not. My friend came and looked at the trades and they were normal values for him, so I'm the only one with access to these trades.
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Just to be clear, with one librarian this way you can make infinite emeralds by buying bookshelves and selling books at 2 emerald profit per trade.
I made a tutorial about this yesterday: https://www.youtube.com/watch?v=n7zaygXTdMA
And I agree. Overall this seems intentional because most of the trades are discounted in a way that seems balanced and reasonable, and it's a really neat game mechanic. HOWEVER, a handful of the trades at their current discounted value are exploitable. The "Buy a bookcase, break it and sell the books" exploit for infinite emeralds is perhaps the best example. So, it may at least need tweaking.
Edit: Oh, and hi Lawrence! 🙂
Can confirm in 23w03a
Confirmed. Pretty sure that's intentional... the villager seems to be pretty grateful towards you that you healed him!