sorry was angy. basically, place an item, and an item behind the item. if you are the co op builder (client) clicking once will stash both the item you clicked on AND the item behind it. it never does more than that. placing 3 items shows that it will only stash the first and second item.
I was at someone else’s condo other day and they accidently stashed additional stuff (that was in way) behind whatever they pointed at- that was on 0.17.9.0, by the way