[BUG] Item not stacking when inventory is full

When inventory have not empty slots, and if you loot something that you already have in your inventory and it item can be stuck more than one in one inventory slot, that item is not picked up until you emptied one slot and then item stuck with another one and empty slot remains empty. Stuckable items suppose to stuck until stuck is full, then they should stop to picked up if ther no empty space in inventory.
Here on screenshot is item that suppose to add to stuck in inventory, but i can't pick it up:
imgur.com/a/yJ4EHTl