My brother, dad, cousin and I just downloaded the game last week and we noticed a bug between dropping items for each other. My dad and brother seem to be able to see dropped items between each other but I see no items when either of them drop something. Also, my dad has dropped a backpack to switch them and then moved all his items to his new backpack but I still seen all his stuff in the old one on the ground. I can't pick it up because he has it but kind of weird to see.