if you use setdata on a chest to put items in it, the items cant be shift-clicked out. and if you put them in the hotbar and right click they dissaparear
try
/blockdata ~ ~1 ~ {Items:[{id:276,Slot:13}]}
on a commandblock that has a chest above, put the resulting sword in your hotbar, and right click
Linked issues
is duplicated by 2
Comments 3
You've left out count. It's the same when using setblock or summon FallingSand to create a chest. If you don't include count then the item is a zero-stack.
At least you remembered slot. That was what I did wrong my first time using fallingsand to make a supply drop. Ended up with each item overwriting the previous one, so I just got the last one on the list.
Seconded-i have the same bug w/feathers