2023 BMW iX Powertrain & Transmission Problems

Yesterday on 7/13, my family and I were fully stopped and parked in a parking spot (car was in park, to the best of my knowledge). The front passenger had just exited the vehicle and was opening the back door where my kids were just beginning to get out of their seats. At that moment, something occurred that caused the car to speed over the parking curb, across a pedestrian sidewalk and struck a brick and glass building storefront. What's odd is, assuming the car was in park, which i believe it was, the car accelerated to max speed and the airbags did not deploy and the hazard lights never turned on after the accident. In addition, the car has safety features designed to detect objects and avoid collisions and should switch the car to park when the car is stopped and doors are opened. I am happy and motivated to make the car available for inspection immediately. I really want to understand what happened and why for my own benefit (and peace of mind) but mostly because I don't want this to happen to any one else in the car or pedestrians in the area. Had my car been parked just a little further down the block, families were eating lunch at an outdoor restaurant which could have ended in serious injury or worse. My car is currently in the tow yard that the police department picked. My insurance is asking me where to tow and I want to make sure it ends up somewhere that can fully diagnose what happened based on the car's internal computer (if possible). The car has been seen by my local police department and fire department that came on site. But, no formal inspection has occurred yet. But will likely be done this week. No warning messages were shown on the car prior to the accident and potential malfunction.

Car suddenly went into neutral and a drivetrain fault error message popped up. Unable to set to drive to continue driving. Powered off car and back on and same error message.