Hello there.

So when I go to the villager and open the trading window it works just fine. Then I try to buy some things. For example I bought a lantern. That also works as intended.

Now the strange thing: When I try to buy a Mending Book, the trade won´t come off and nothing happens, although I have enough materials.

It gets stranger (Screenshots down below, view them in the correct order: Earliest time stamp to latest):

When I Shift-Click the Mending-Trade, the book pops down into my inventory. Now when I close the trade window and open up my inventory, the enchanted book I just bought reverts itself into the emeralds and the unenchanted book.

This same villager worked just fine in 1.14.2, since 1.14.3 came out, he´s completely and utterly bugged into oblivion as I just explained.

I´d be really happy, if someone looks into it.