Why don't OpenStreetMaps zoom larger than 200m in Garmin Connect Web (the map disappears from 100m)?
OSM on Connect is a copy served from connectcache20.azureedge.net. And you are right, I just checked, for some areas there is no tiles for 50m, it ends with 100m. But usually there is, I spotted lack of 50m on some quite empty areas. So maybe it was intended to save server's space or maybe it generates unused tiles after some time from first request.
Well, they update their copy quite rarely, so probably nothing to do with it. You can only make simple redirect add-on for a web-browser to redirect requests from cache website to original OSM website.
