MT7921 scan sometimes only returns 1 result when expected 2

[gen-nimble]

context:

• wpa_cli & wpa_supplicant v2.11
• kernel/driver from v6.17.9
• and firmware info shown below

[  202.322602] mt7921e 0001:01:00.0: ASIC revision: 79220010
[  202.406670] mt7921e 0001:01:00.0: HW/SW Version: 0x8a108a10, Build Time: 20251118163143a
[  202.420761] mt7921e 0001:01:00.0: WM Firmware Version: ____000000, Build Time: 20251118163234
[  203.540766] mt7921e 0001:01:00.0 wlP1p1s0: renamed from wlan0

we have created a test environment with 2 APs (Cisco CW9176i) broadcast at 6ghz with same SSID

when we conduct the scan, with SCAN command via wpa_cli, sometimes it only gives 1 scan results, or in otherwords the scan results it returns seems very flaky/random, and after wait a while we do SCAN again, both AP appears

> scan_results
bssid / frequency / signal level / flags / ssid
59:e7:39:d8:74:4d       6055    -56     [WPA2-SAE+SAE-EXT-KEY+FT/SAE+FT/SAE-EXT-KEY-GCMP-256+CCMP][SAE-H2E][ESS][UTF-8] test_ssid_6ghz
> scan
OK
<3>CTRL-EVENT-SCAN-STARTED
<3>CTRL-EVENT-SCAN-RESULTS
> scan_results
bssid / frequency / signal level / flags / ssid
59:e7:39:d8:74:4d       6055    -56     [WPA2-SAE+SAE-EXT-KEY+FT/SAE+FT/SAE-EXT-KEY-GCMP-256+CCMP][SAE-H2E][ESS][UTF-8] test_ssid_6ghz
-----------------------wait for a while --------------------------

> scan
OK
<3>CTRL-EVENT-SCAN-STARTED
<3>CTRL-EVENT-SCAN-RESULTS

> scan_results
bssid / frequency / signal level / flags / ssid
59:e7:39:d8:74:4d       6055    -57     [WPA2-SAE+SAE-EXT-KEY+FT/SAE+FT/SAE-EXT-KEY-GCMP-256+CCMP][SAE-H2E][ESS][UTF-8] test_ssid_6ghz
e9:ed:c2:1f:2b:e2       6135    -62     [WPA2-SAE+SAE-EXT-KEY+FT/SAE+FT/SAE-EXT-KEY-GCMP-256+CCMP][SAE-H2E][ESS][UTF-8] test_ssid_6ghz

we have observed this issue in v6.7 kernel/driver, and thus we upgraded to v6.17.9, while the issue still persists.

any insight to further troubleshooting this problem would be very much appreciated.