When my friend and I, in co-op and single player, wanna put stuff from the inventory to a chest, we can’t get it to quick stack, shift+left click and double click, it won’t stack in the chest.
Like if I have 10 wood on me and I wanna put it in a full chest which already has 40 wood in one slot, I have to drag it in to the chest, but if I make one slot in the chest free I can shift+left click it in. so the slot now holds 50 wood, and then shift click an item in the last slot.