I picked up my 2022 Tucson PHEV on Sept 28th, I noticed the same thing after the first few days of playing around with it. Anyway after some fiddling it seems when I turn off the climate control it does not do it anymore and stays on EV. I tried it with the seat warmer and steering wheel warmer and it still stayed on EV. Periodically, let's say in four or five days it may cycle the motor and I am not sure why (maybe just to cycle the motor). Regardless, most of the time it is on EV and I have to say that this is an amazing car.