For the City Hybrid, when the door is open and seatbelts are not fastened, the gearbox auto shifts from D back to P.

Today, on a slight incline/slope, while opening the door to press a switch to get out of housing area (windows can't be wound down as of yet, tint is still new), the car went straight into P without me noticing, and as i switched back into D to go, the car shuddered a little. (kinda like how a normal gear shift would feel like when you shit it from P to D after on an incline.

Anything to be worried about? AFAIK the car was stationary, but i always thought it wouldn't shove the car into P against my wishes lol. What if i open the door while driving and i'm not wearing my seatbelt? Ie to check if the door is fully closed after driving out of my housing area.