It’s normal because the backhaul connection is still functioning - https://support.keenetic.com/titan/kn-1812/en/15237-what-hidden-wi-fi-networks-does-the-router-broadcast-.html
there is an article in user manual - https://support.keenetic.com/titan/kn-1811/en/50384-how-to-change-an-internet-connection-policy-for-download-station-.html