Route builder. Route not buildable
I have over the weekend tried to understand the connection between Strava Routebuilder and OSM. The route builder relies on map data from OSM. That's clear.
But to me it seems like the route builder will not allow you to build a route on some specific roads/tracks.
An example is the Serangan island (see attached) where the South east corner of the Island is non route buildable (so to speak). Where the South West corner it is buildable.
The tracks on both south east and south west of the island are categorized as the same in OSM, "Unmaintained Trackroad". So I can't figure out whats the problem. It appears not only on Serangan Island but in more places as well.