I first came across this when I was trying to make a python program that used programs to scan for wireless networks. I've used the following tools:
iwlist, iw, wpa_cli, nmcli, and iwconfig
I run into the same behavior on all of them. Suppose you're sitting by your computer and wireless access point/router. Type out one of the following commands, assuming your wifi adapter is named wlan0, turn of the router, then press enter in the terminal window.
iw wlan0 scan | grep SSID iwlist wlan0 scan | grep SSID wpa_cli -i wlan0 scan && wpa_cli -i wlan0 scan_results nmcli device wifi rescan && nmcli device wifi list
All of the commands still show the SSID for quite some time. I imagine longer than it would take for the E&M standing wave to disappear. Does anyone have any fix for this problem?