I don’t believe it will but in truth I do not know that for sure. It seems to me that the tester copies down the O licence number from the disc, if there is one. If there is not he does not put anything down. Truck dealers must put loads of vehicles through without discs / that are not on an O licence so it cannot be that unusual. Whether someone else in the “back office” then tries to allocate a failure (or pass) to an O licence via the reg plate, as I said, I do not truthfully know for sure. Maybe someone here has asked the question of them ?