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scren result doesn't match probe-response

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I have three APs and let wpa_supplicant connect to one:

1253271753.960692: Received scan results (3 BSSes)
1253271753.960710: ##HS 0: 00:1b:d4:44:35:90 ssid='MNWPA' freq=2412
1253271753.960728: ##HS 1: 00:1b:53:11:dc:40 ssid='MNFUNK' freq=2412
1253271753.960745: ##HS 2: 00:13:19:80:da:30 ssid='MNHS' freq=2412
...
1253271754.402004: CTRL-EVENT-CONNECTED - Connection to 00:13:19:80:da:30 completed (auth) [id=0 id_str=]


When I change the the access-point with MNHS/WPA to XXXXX/WPA2.
The APs sends a de-auth message, and wpa_supplicant does a scan:

 56.445693 00:13:19:80:da:30 -> 00:20:a6:61:15:c0 IEEE 802.11 Deauthentication,SN=555,FN=0
 57.117063 00:20:a6:61:15:c0 -> ff:ff:ff:ff:ff:ff IEEE 802.11 Probe Request,SN=8,FN=0, SSID: "MNHS"
 57.307272 00:20:a6:61:15:c0 -> ff:ff:ff:ff:ff:ff IEEE 802.11 Probe Request,SN=9,FN=0, SSID: "MNHS"
 57.518420 00:20:a6:61:15:c0 -> ff:ff:ff:ff:ff:ff IEEE 802.11 Probe Request,SN=10,FN=0, SSID: "MNHS"
 58.104889 00:20:a6:61:15:c0 -> ff:ff:ff:ff:ff:ff IEEE 802.11 Probe Request,SN=11,FN=0, SSID: "MNHS"
 58.105612 00:20:a6:61:15:c0 -> ff:ff:ff:ff:ff:ff IEEE 802.11 Probe Request,SN=12,FN=0, SSID: "MNFUNK"
 58.105967 00:1b:53:11:dc:40 -> 00:20:a6:61:15:c0 IEEE 802.11 Probe Response,SN=1496,FN=0,BI=100, SSID: "MNFUNK"
 58.555765 00:1b:53:11:dc:40 -> 00:20:a6:61:15:c0 IEEE 802.11 Probe Response,SN=1503,FN=0,BI=100, SSID: "MNFUNK"
 58.556370 00:1b:53:11:dc:40 -> 00:20:a6:61:15:c0 IEEE 802.11 Probe Response,SN=1504,FN=0,BI=100, SSID: "MNFUNK"
 58.607339 00:1b:53:11:dc:40 -> 00:20:a6:61:15:c0 IEEE 802.11 Authentication,SN=1505,FN=0
 58.636330 00:1b:53:11:dc:40 -> 00:20:a6:61:15:c0 IEEE 802.11 Authentication,SN=1506,FN=0

So far, so fine. Now let's look what wpa_supplicant get's back
as a scan-result:

1253271769.784819: Received scan results (3 BSSes)
1253271769.784836: ##HS 0: 00:1b:d4:44:35:90 ssid='MNWPA' freq=2412
1253271769.784855: ##HS 1: 00:1b:53:11:dc:40 ssid='MNFUNK' freq=2412
1253271769.784871: ##HS 2: 00:13:19:80:da:30 ssid='' freq=2412

Hey, there was no probe-response from da:30 at all ...

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