So far just re-calibration and general check. Everything seemed fine. I am leaning towards it being a software issue and am hoping an upcoming software update fixes it. It had been working just fine. I am probably going to wait for a software update before digging in to it much deeper with the dealer. I did confirm with OnStar that everything looks good on their end -service enrolled, etc.
I am having the exact same issue. Super Cruise works correctly, auto lane change will not work for me. No resolution yet. Please update the thread if yours gets fixed.