as you might know from my previous postings. my set is 3 APs (each 2 bands and each band has 2 SSIDs)
when i press scan in wireless menu at the radio... the g band show me all APs which are in the area...
when i do the same in a (ac) band i get always "no data" but this is impossible, they muss see each other (or at least one of them because on my mobile i also see them (when im next to one of them)
It is not always possible to scan on the 5 GHz band, if you're concurrently using the interface already (e.g. as AP) - this depends on hardware, driver and regulatory domain (e.g. this seems to be easier on ETSI, than in FCC). You may have to stop the AP interface beforehand, this is not (necessarily/ really) a bug.