issue with BSS_FLUSH - cache not cleaned

[Antonio Prcela]

The results of the first scan are still available when scanning for all networks
and within 10 seconds scanning again but for specific frequencie(s).
Even if 'BSS_FLUSH' used in between. See exaple:

> SCAN
OK
<3>CTRL-EVENT-SCAN-STARTED
<3>CTRL-EVENT-SCAN-RESULTS
<3>WPS-AP-AVAILABLE
<3>CTRL-EVENT-NETWORK-NOT-FOUND

> SCAN_RESULTS
bssid / frequency / signal level / flags / ssid
aa:aa:aa:aa:aa:aa       5180    -42     [WPA2-PSK+SAE-CCMP][WPS][ESS]   AP1
bb:bb:bb:bb:bb:bb       5180    -66     [WPA2-PSK+SAE-CCMP][ESS]        AP2
cc:cc:cc:cc:cc:cc       2437    -56     [WPA2-PSK-CCMP][ESS]    AP3
dd:dd:dd:dd:dd:dd       2462    -91     [WPA2-PSK-CCMP][ESS]    AP4

// so far all ok. now flush cache and scan only one frequency

> BSS_FLUSH
OK

> SCAN only_new=1 freq=2462
OK
<3>CTRL-EVENT-SCAN-STARTED
<3>CTRL-EVENT-SCAN-RESULTS
<3>WPS-AP-AVAILABLE
<3>CTRL-EVENT-NETWORK-NOT-FOUND

> SCAN_RESULTS
bssid / frequency / signal level / flags / ssid
aa:aa:aa:aa:aa:aa       5180    -42     [WPA2-PSK+SAE-CCMP][WPS][ESS]   AP1
bb:bb:bb:bb:bb:bb       5180    -66     [WPA2-PSK+SAE-CCMP][ESS]        AP2
cc:cc:cc:cc:cc:cc       2437    -56     [WPA2-PSK-CCMP][ESS]    AP3
dd:dd:dd:dd:dd:dd       2462    -90     [WPA2-PSK-CCMP][ESS]    AP4

// it replies with same results as if no 'freq=' was set
// if checking with 'BSS ID-0' -> same result, nothing flushed
// flush again, or wait 10s, scan again

> BSS_FLUSH
OK

> SCAN only_new=1 freq=2462
OK
<3>CTRL-EVENT-SCAN-STARTED
<3>CTRL-EVENT-SCAN-RESULTS
<3>CTRL-EVENT-NETWORK-NOT-FOUND

> SCAN_RESULTS
bssid / frequency / signal level / flags / ssid
dd:dd:dd:dd:dd:dd       2462    -88     [WPA2-PSK-CCMP][ESS]    AP4

// works now

Anyone got an idea what am I doing or what's going wrong?