Hi Vera,
thanks for the quick reaction. `lanes:backward` and `lanes:forward` do not make sense together with `oneway=yes`. I have deleted both tags and the wrong `destination:*:backward` (https://www.openstreetmap.org/way/327208970). In addition both detour-relations still had not the correct order of the members and a wrong member regarding https://www.openstreetmap.org/relation/6971639. I have now fixed all problems along side more corrections in https://www.openstreetmap.org/changeset/134044961. Looking at the history of the objects might give you a hint about my changes. Especially for :lanes-tagging and relations iD might not be the best editor software.
All the best,
skyper