Wifi disabled when GL-AR300M setup via ethernet

I’ve seen this a few times now. If I setup this device via ethernet as soon as I disconnect the LAN cable the wifi SSID has “disabled” appear and the wifi icon shows no signal.

The only way I can get wifi to work is if I set it up via wifi.

It seems to get the interfaces confused if I do the setup via ethernet. I prefer to do it this way as it is less likely to get hacked before I can set it up. I could disable both wifi and then just do the setup, then reenable the wifi. The SSID do appear in the list, but show “disabled” or no connection beside it. Is there a work-around for this so that I can tell it the correct interfaces or is it part of the nature of DHCP networking.

Could you please take a video of what you said?