I came across a minor bug, but lost two potions to it. When you are in the inventory panel and want to split item by shift holding, if you put the item on top of another item, the latter vanishes/is replaced by the splitted item. Repeated with just taking any item while holding the shift key (you can delete the whole inventory).
Issue: Object vanish from inventory When: If moving object while holding shift and placing that object on slot occupied by another item. Steam version, no mods, win 10 home, Reapers coast
