Honestly, I have no idea, but I would love to see them introduce it on more A350s (or at least keep it on LRM, sort of like a special livery), because I really like the look. I don't have any ideas if there was a reason for this, or if it was accidental but they haven't changed it, and they've had almost 2 years to fix it if they didn't want it. It may have been a mistake but it is probably not economical to repaint the front of the plane and take it out of service for too long.