This is a new security feature in Network Manager.
Disable the MAC address randomization by creating the file
/etc/NetworkManager/conf.d/100-disable-wifi-mac-randomization.conf
with the content:
[connection]
wifi.mac-address-randomization=1
[device]
wifi.scan-rand-mac-address=no
or:
mv /etc/NetworkManager/conf.d/100-disable-wifi-mac-randomization.conf /etc/NetworkManager/conf.d/100-disable-wifi-mac-randomization.conf.bak
echo "[connection]" >/etc/NetworkManager/conf.d/100-disable-wifi-mac-randomization.conf
echo "wifi.mac-address-randomization=1" >>/etc/NetworkManager/conf.d/100-disable-wifi-mac-randomization.conf
echo -e "\n[device]" >>/etc/NetworkManager/conf.d/100-disable-wifi-mac-randomization.conf
echo "wifi.scan-rand-mac-address=no\n" >>/etc/NetworkManager/conf.d/100-disable-wifi-mac-randomization.conf
Afterwards you may need to update your device’s MAC in your DHCP server.
Then reboot.