In the past, I thought that one could neither plug or unplug a charging cable into the Model S when the car was locked. Now, however, it appears that a locked car now only restricts unplugging, not plugging. In recent days I've noticed that I'm able to plug my garage HPWC into my car while the car is locked. I can't, however, unplug it once plugged in unless I first unlock the car. Has this always been the case and I've overlooked it?