If you stand where a door would open and then hack the door, the door will not open. You have to back away from the door beyond the distance that it would normaly open at and then walk back towards it for it to open.
On a side note and these are tweeks and not nessisarily bugs but the doors in garden (and on other maps with similar doors) will only open if you walk towards the middle of the door. If you walk up to the door on either side of the middle it simply will not open. Also the doors seem to triger open or open too slow to just walk through, I always end up hitting the bottom of the door as it opens and getting stopped. Not a bug but could use a lil' polish.