Unable to answer "What’s the surface here?" – Marked Crossing – osm.org/way/728184695 via StreetComplete_ee 57.2:

Selon moi, n'existe pas

Unable to answer "What’s the surface here?" for osm.org/way/273443074 via StreetComplete 50.1:

Bloc d'ardoises

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https://westnordost.de/p/126478.jpg