https://www.openstreetmap.org/way/1046461518/ is on the official map as part of bridle path network https://www.foret-de-soignes.be/wp-content/uploads/sites/3/2021/09/Zonienwoud-FDS-MAP-Front-juni2021-gecomprimeerd.pdf 

The other segments of Diependelle not so i think we can restore horse=yes for this part , but of course surey is always welcome.