4 smooth sandstone = 4 stacked smooth sandstone (pointless crafting recipe bug)

There is a pointless crafting recipe that turns 4 smooth sandstone into 4 smooth sandstone. This logically makes sense, but it's kinda weird and could possibly confuse some people...

EDIT: For some reason I can't add a screenshot as an attachment, so I uploaded it to imgur: http://i.imgur.com/mFqD1.png