Happened to me twice yesterday after autopilot was already engaged stopping at a red light, not engaging while stopped. The vehicle came to a stop on its own via autopilot, I was stationary and the vehicle in front started to move, I was shocked to see my vehicle didn't move, when I tapped the pedal I started moving again. I didn't see the hold the first time, the second time it happened a few minutes later in the same traffic, I saw the hold appear while I was stopped not touching anything. If this is the case I may be reporting a bug if everyone is certain this isn't new.