No, no, it should be mapped, is a real existing object. But it should also be analyzed in the context ot the other mapped objects. I'm not sure what the best mapping would be, but there is a need to map that you cannot  turn left like the previous version of this restriction was imposing. https://www.openstreetmap.org/relation/4848638 . Maybe adding the restriction, maybe fixing drawing the service way, i don't know...