Hello,
I do not understand why navigator does not find a car route from this segment (Chemin : Liaison avec la Sarre (560815240) | OpenStreetMap) to this segment (Chemin : Liaison avec la Sarre (445536696) | OpenStreetMap)
In Openstreetmap, I just modified the pedestrian crossing which was not in tunnel mode, could the fact that the pedestrian crossing was not in tunnel mode create a conflict with the highway?