I'm trying to remove a specific, named, item if it is dropped on the floor. I have the following on my command block:

kill @e[type=Item] {Item:{tag:{display:{Name:"RedFlag"}}}

But it's removing all items, not just the one I want. What am I doing wrong?

I also tried

kill @e[type=Item] {Item:{id:"red_flower",Damage:2}}

But that didn't work either, it's still removing all items, even things that aren't red flowers!