Villagers refusing to trade, only trading when more items are put in slot and take more items than advertised.

Villagers are refusing to trade when putting the exact number of required items in a trading slot. They however accept the trade if 64 items are put but take more than what the villager advertises. For example, if a Cleric is selling 1 emerald for 3 gold ingots, putting 3 gold ingots will not work while putting a stack will but the villager will take 10 gold ingots for 1 trade instead of taking 3. See this video by Bite The Apple who discovered this as well one month ago : https://www.youtube.com/watch?v=VGvFBqfVjBo