I've had a world where i accidentally died, and there was no way to revive myself. so i used the command:
it spawned the item but it didn't let me haunt it or pick it up.
same happened with the chester bone thingy that i tried to spawn, it looked like i spawned it but i can't pick it up.
just open up your console and type: c_spawn ("amulet") and it doesnt work