Locking from inside

Hey guys, in my 2011 Z4 I got a quick question, when I'm inside my car with my key fob (not in the ignition) and I lock my doors from inside and they are locked usually I can open my driver side door by pulling the handle twice and it opens but now it's not doing that until I unlock it, any idea why this is?
 
It's a feature, not a bug :). Keep in mind this car can be left with the top down in a parking lot - now imagine if somebody would be able to open the door that easily when the top is down. (my opinion though)
 
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