Example, these two rivers in France :
- "Rhin" (close to Strasbourg) : lat 48.601342 N, long 7.811874 E
- "Rhône" (close to Lac du Bourget) : lat 45.813456 N, long 5.783069 E
are drawn as thin line.
It is not a OSM bug because these rivers are normally drawn in openstreetmap or in Osmand.
Several persons have already seen this bug (my last message about this bug was
in september 2017), do you think you will resolve this problem one day !