/setblock command : some data id that should not be allowed

I have found some ... weird looking blocks while playing around with the new setblock command. There might be more :

/setblock ~ ~ ~ minecraft:cocoa DATA (replace DATA by any number between 12 and 15 inclusive)
/setblock ~ ~ ~ minecraft:pumpkin_stem DATA (replace DATA by any number between 8 and 15 inclusive)
/setblock ~ ~ ~ minecraft:melon_stem DATA (replace DATA by any number between 8 and 15 inclusive)