Standard is a path not forbidden for cycling. https://wiki.openstreetmap.org/wiki/OSM_tags_for_routing/Access_restrictions#Belgium

https://www.openstreetmap.org/directions?engine=graphhopper_bicycle&route=50.76076%2C4.45316%3B50.76016%2C4.45473#map=19/50.76052/4.45433&layers=N