The Dealer tells me that the 2022 Denali has some "new stuff" meaning new electronic features that they are still learning about. I'm not sure but I think the Perimeter lighting is one of them.
So far every time I have seen the lights come on it has not been from the Key Fob, it's been opening a door from inside the vehicle or just pushing the button on the door handle. I have tried it with the Key Fob and had it work and had it not work. Strange
Here is another inconsistent thing it is doing, and I may start a new thread for this. Sometimes when I push the Park button the Parking Brake will activate. But not always. Same with going to Reverse when I have the Parking Brake set. Sometimes it will release, sometimes it will not and I have to push the release button. Not a big deal but you have to pay attention to what is or is not happening.