Hi,
https://www.openstreetmap.org/way/1305666893 is not a riding centre but a riding arena and therefore should better be tagged leisure=pitch + sport=equestrian (+ surface=sand) instead of leisure=horse_riding (+ natural=sand), see infobox on top of https://wiki.openstreetmap.org/wiki/Tag:leisure=horse_riding. This probably also applies to https://www.openstreetmap.org/way/1305666894 (looks like a round pen). Compare old discussion https://www.openstreetmap.org/changeset/128346263 and https://wiki.openstreetmap.org/wiki/How_to_map_a#Riding_centre_(equestrian)