Per Crispin-at-Linknode's suggestion :
Mid-scales cross-country routing - the track style completely merges with the contour style making it very difficult/impossible to identify.
+
At zoom 13 paths are not shown at all, while they were displayed on OHM-legacy
zoom 13 :

Same place zoom 14 :

Per Crispin-at-Linknode's suggestion :
Mid-scales cross-country routing - the track style completely merges with the contour style making it very difficult/impossible to identify.
+
At zoom 13 paths are not shown at all, while they were displayed on OHM-legacy
zoom 13 :

Same place zoom 14 :
