hAP ac 6.41.2 - WiFi 2,4GHz stuck after running Scanner

Hi, I’m using MT hAP ac 6.41.2 with latest firmware, only as Access Point in our household with few laptops and smartphones.

Here is my WiFi configuration:

/interface wireless
set [ find default-name=wlan1 ] country="czech republic" disabled=no \
    distance=indoors frequency=auto frequency-mode=regulatory-domain mode=\
    ap-bridge ssid="JaR WiFi" wireless-protocol=802.11
set [ find default-name=wlan2 ] mode=ap-bridge ssid="JaR WiFi" \
    wireless-protocol=802.11
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa-psk,wpa2-psk eap-methods="" \
    group-ciphers=tkip,aes-ccm mode=dynamic-keys supplicant-identity=MikroTik \
    unicast-ciphers=tkip,aes-ccm wpa-pre-shared-key=*tennumbers* \
    wpa2-pre-shared-key=*tennumbers*

Most important: “band=2ghz-b/g” is missing for some reason in rsc file.

After running (Start and Stop) a “Scanner”, wifi module won’t turn back to “R - running” state = clients cannot connect (see attachment), until interface or MT restart.

Cpu usage is normal.
Have supout file generated during problem.

Pavel J.
supout -80211ag, Scanner start stop, clients cannot connect.png