[B789 pilot]

It seems the system assumes the key remains within the vehicle unless a door is opened, which might be a trigger for rechecking the presence of the key signal. So yes, opening the door likely prompts the vehicle to verify whether the key is still present.

Alternatively, it's worth questioning whether the Faraday pouch is fully effective. If it's not completely attenuating the key's signal—especially at close range—it could explain why the car still permits the transition from utility mode to drive without raising a warning.

In either case, it's a potentially concerning flaw, as the system behaviour seems to depend more on assumptions than a consistent live key check.