/blockdata in chests creates ghost items

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