I am unable to trade some pumpkins with a villager but I can trade and have traded other things. It said that the villager didn't want the item when I placed it into the trade slot and when I pressed the button the trade pumpkins with the villager, it didn't accept it. This world was created just before 1.16.100 but I only unlocked the trade after the update. I haven't tried reinstalling the game but I have reopened the world multiple times, I have made sure I have enough pumpkins and I have not traded pumpkins with that villager yet. I haven't tried recreating this.