So full disclosure, I had the same thing happen to me. I do not think I made any coding changes to resolve it but I will go through my change logs.
If I recall correctly, I was annoyed since the coding was correct, unplugged the Quadlock connector and checked that everything looked engaged properly, plugged the Quadlock back in, rebooted the infotainment unit, cleared the dash faults by turning the wheel all the way left, right, and back to normal (I had disconnected the battery so the faults resulted from that), and then it magically worked after a drive. I know it is likely less than useful to hear about some bizarre sequence of events that may have coincidentally occurred before my reverse cam started working after a similar problem, but you never know
Do you have any faults in any modules that mention the camera if you do a full scan?