Hi,
You have retagged this object from a building to a riding stables (leisure=horse_riding). Therefore it is no longer rendered as a building on the map. But it looks like a building on Bing. If it is a stable building you can tag it building=stable (and there is also a preset for that in iD).

The tag leisure=horse_riding shall be used for the whole facility. I would recommend to add a separate object (area or node) for this whole facility .

And https://www.openstreetmap.org/way/816835472 doesn't seem to be a riding stables either, it looks like a riding arena and should be tagged leisure=pitch + sport=equestrian (and there is also a preset for that in iD).

Compare
https://wiki.openstreetmap.org/wiki/Tag%3Aleisure%3Dhorse_riding
https://www.openstreetmap.org/way/1005924061
https://www.openstreetmap.org/node/2434557134