In creative mode, doors should not be dropped by hitting. If you hit the door on the bottom it works, but if you hit upper part of the door it is dropped.
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The correct action should be as follows:
12w40a Oct. 4, 2012: The left-click action will no longer open doors, pull levers, push buttons or open trapdoors. Use the right mouse button!
If you are still able to open doors by striking them, then that is what should be fixed according to the update notes.
In creative we are breaking the door. When you do it on the top it drops a door. When you do it on the bottom it does not drop a door. They should both not drop a door.
Confirmed, reproducible. Breaking doors in creative mode do not result in a door drop if struck at the bottom of the door, but results in a drop when struck at the top. This happens regardless of the tool being used, and does not seem to have an effect in survival mode.
Confirmed in 1.4.2-pre

Also refer to MC-20. Apparently pistons are also affected.
Piston bug is here: MC-149
I guess all these bugs are one bug and there just needs to be a better system for breaking multi-tile blocks.
Happened when I tested it.