Ok I can confirm that at least some accessories that plug into the passenger side wiring harness prevent FSD from working properly after this latest update. It appears as though they interfere with the driver occupancy detection.
current solution is to remove the intermediate harness.
I have the same lightbar and now have an issue after the holiday update. I’ll try unplugging it and resetting to see if that fixes it since FSD is more important to me. Maybe it’ll be fixed in the future.
Also I’ve had no issues with the lightbar causing any audio problems or errors, until now...