The Visitor map does not show any Region (I think since the last upgrade from matomo 3 to 4.2)
This may be related https://github.com/matomo-org/matomo/issues/16714
While regions are detected for most users
We are using the maxmind geoip2 (free) db
EditionIDs GeoLite2-ASN GeoLite2-City GeoLite2-Country
Thanks for creating the issue. I just had a quick look and it seems the map leaks the iso attributes so the visitors can't be shown correctly. I'll try to prepare a PR that should fix this quickly.