My area is well mapped if that’s what you’re asking. The openstreetmap.org is no longer accessible because it became a Cloudflare site, but OSMand shows that the map covers the area I was in back when I tested Street Complete while online with GPS running. That test was actually a few weeks ago, before openstreetmap.org became a restricted access website (so Cloudflare is unrelated to this particular problem).
Do you have ideas what could be causing the issue? Like I said, I'm a novice, and by the sounds of it you sound like you know a lot more about this ecosystem than I do.
Really hoping for a dev or someone to wander in here...