The bug

When you try to take non-stackable items successively during an exchange, the sound of "agreement" of the villager is still played even if you don't pick the item.

How to reproduce

1. Find or spawn a blacksmith villager (for example)
2. Trade with him to obtain an exchange with a non-stackable item
3. Trade the goods that the villager wants to give you the non-stackable item
4. Try to take several non-stackable items in a row without dropping the item you took and without Shift Clicking
   → You will see that the villager makes his sound of "agree" when you click while you can not take the item

Example

Here is an example in video: Villager make the agree sound even if you don't pick the item if you can't take the item.mp4