[Invalid] Virtual wireless SSID Broadcast bug (Tomato Toastman)

On the 5GHz Band (wl1.1) the SSID Broadcast must be enabled to login to that SSID.
On the 2.4GHz Band (wl0.1) it works fine with SSID Broadcast Disabled.

Router: ASUS RT-AC66U
Firmware: 1.28.0511 MIPSR2Toastman-RT-AC K26AC USB VPN

Edit: There is probably something wrong with my network card or its drivers cause I could connect to the wl1.1 SSID with a USB network card.