Tested with the latest OpenWrt 21.02.2, the key action is to set option htmode 'VHT20' rather than VHT80, you can leave the country code as 00 (world). Then restart the raspberry 4B, it's AP SSID will be seeable by clients.
Tested with the latest OpenWrt 21.02.2, the key action is to set option htmode 'VHT20' rather than VHT80, you can leave the country code as 00 (world). Then restart the raspberry 4B, it's AP SSID will be seeable by clients.