Shutting down if the driver exits the vehicle isn't a bug...it's a purposeful choice by BMW. FWIW, the vehicle will stay running if your seatbelt is on and you open the door, as it realizes you aren't planning to exit the vehicle. You can tell it to continue the HVAC once you shut it off, if that's an issue and the entertainment system will continue to run, and restart if you press on the volume knob after it times out.
On an ICE, keeping the vehicle running might have some advantages, but not many if you're trying to optimize efficiency.
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