Stress test - v0.63.146842
My friend dropped is Weapon(CZ61 Skorpion).
He picked it up again, but both of us saw the weapon now in his hand and on the ground.
My inventor (Bag pack and clothes) had no space to store the Weapon, but I tried to pick it up too, and picked up a invisible version of the gun.
It didn't showed up in my inventory, but my hands looked as if they held a weapon, I could not drop it or use a item in my "hand-slot".
Even after several restarts and re-logins the slot is not usable, so I can't eat, drink and craft.
Interacting with ladders, wells and so on do not change this.