Villager does not trade Pumpkins with me.

I try to trade pumpkins with a villager whom I have given the name "Simon", but he does not accept them. In the trading window, the offer is

Pumpkin > Emerald

red and not available, so I can't trade with him.

I hope they can help me because I have a lot more pumpkins and sat for more than three hours to get these pumpkins.

In the appendix you can see a video of the error.

I've already tried to replace the pumpkins and mine them again, but it didn't work.

Greetings Fabi135