Villagers don't trade

Villagers trading bug ¿?

I was going to trade stone and when I tried to trade it, it wasn't working. I tried closing my world, closing the game, but it still isn't working.

It's not that I traded to much and reached the limit that is shown with the red cross, it was my first trade in the day and when I put the stone on the slot, the emeralds don't appear. So it looks just like normal trading, but without the trade.

Also, I have a visual bug I really don't care and it doesn't affect anything.