Question on 2 surprising routing decisions in France

Hello everyone,

I recently discovered cycle.travel, and I'm now testing it. I tested the round-trip suggestion feature in France, and if it's working way better than other apps, I got a bit surprised by 2 routing decision cycle.travel took.

The first surprising routing is reproduced in this example journey: https://cycle.travel/map/journey/648597 - do you understand why the app route people through the D 448 to Boulevard Charles de Gaule (i.e. the second part of the routing, not the first part) instead of passing by the bicycles path number 3 (also named "Scandibérique") ? The D 448 is terrible for bicycles: lots of car traffic, fast cars, stressing placing on the road with all the accesses to the "La Francillienne" major road, while the "Scandibérique" is clearly mapped on Open Street Map (I checked), and marked as accessible for bicycles.

The second surprising routing is reproduced in this second example journey: https://cycle.travel/map/journey/648610 - do you understand why it makes this back-and-forth in the "Allée du Bois des Folies" ? (we don't see the name of the street in cycle.travel map, but it's this little perpendicular dead-end street we can see along the way).

Thank you in advance !