802-11-wireless.band: bg still connects to 5Ghz

As I’m facing issues with connection betwenn HassIO on Raspi connected to 5Ghz WLAN and Aqara Hub M2 to 2,4 Ghz I would like to connect HassIO fix to 2,4Ghz.

I’ve edited the config, restartet host and nmcli shows:

# nmcli con show
NAME              UUID                                  TYPE      DEVICE
Supervisor wlan0  6779e42c-fccf-4222-a63c-fe2d571e2ce6  wifi      wlan0
HassOS default    f62bf7c2-e565-49ff-bbfc-a4cf791e6add  ethernet  --

# nmcli con edit "Supervisor wlan0"
nmcli> print 802-11-wireless.band
802-11-wireless.band: bg

which should lead to 2,4Ghz connection from my point of view. Looking in Fritzbox it still tells me that Raspi is connected within 5Ghz band.