My car has keyless ignition.Recently,whilst on the motorway,my grandson made a joke pretending to throw the keys out of the window.What would happen if he did?
Nothing. The car would continue to run as normal. Try it yourself - get out of the car with the engine running. You'll probably get a message or some other kind of warning but the engine won't stop.
Certainly not OG. The key, like a physical key, is only required to start the car. If you could remove the ignition key without turning off the engine (and I could on my old Ford Anglia) you would be in the same position.
I would guess that the car would restart itself in those circumstances Mexican because you haven't turned off the ignition. Why don't you try it; stop the car on your drive or in the road, hand your key to someone outside it, wait till the engine turns itself off and then try to set off again.
My car is too old to have this silly "engine off in traffic stop" system, so I can't try it for you.