"Opening" the 'chemin du Viaduc' in https://www.openstreetmap.org/changeset/138679132 seemed to have fixed both https://www.openstreetmap.org/relation/34345 and https://www.openstreetmap.org/relation/12421037 on https://relatify.monicz.dev/

Do you have OSMAnd live, e.g. can you look at a recent map data update to see if its also fixed there?