I've noticed now that "hold mode" is enabled in latest update that, when I go up a steep incline and put the car in reverse, before I press the accelerator, the car drives about 1/2 foot forward. Today I noticed, while in drive leaving a parking lot with an angled drop, that the car went backwards 1/2 foot instead of stopping on the incline.
In the latter case, there could have been a car behind me (though probably not as I was going forwards). Very odd. It is supposed to be using the regen brakes and then apply the brakes, not reversing direction to hold at some random position.