One problem related to back up lights has been reported for the 2021 BMW M5. The most recently reported issues are listed below.
The reverse backup lights and camera image is so dim and limited as be unusable and very unsafe when backing up at night in darkness. Dealer service could not fix as designed in! I believe same system used on all 2021 series 5 cars. Left car at dealer with fobs as I am refusing the car cancelling sale as hidden defect unsafe and not fixable per dealer service mgr. Attached photos are actually brighter than what driver sees. View is from my garage and driveway to backup. Red tint is break lights stronger than weak backup lights all very abnormally dim with very restricted illuminated view.