EV mode MG EHS PHEV

Hi, everybody. I’ve had the EHS for a few weeks. (Bj. 2022) I’m so happy so far. Processing, consumption and optics are looking good in the eye. My opinion. I have one for this. If I go in EV mode, of course, climate from ??, and have to drive first 2km downhill, the mode automatically turns on “car”. Why does it do that? And how can you prevent it. If you can. Battery is full and, as I said, climate.