Hi,
I have a TP-LINK TL-WR902AC v1 with OpenWrt 18.06.1 r7258-5eb055306f running. I configured 2.4 and 5 GHz Wlan as a AP with Luci. When I analyse the wifi networks around me, with the tool "LinSSID" on my Laptop I can see other SSIDs, but not the 5GHz of the WR902AC.