I just managed to set ethernet MAC with rc.local by writing the following into /etc/rc.local,

#!/bin/sh
ifconfig eth0 down 
ifconfig eth0 hw ether 00:xx:xx:xx:xx:xx
ifconfig eth0 up

Remember to replace with your MAC to be fixed and to make sure rc.local service is up with the commands below.

chmod +x /etc/rc.local
systemctl start rc.local
systemctl enable rc.local
systemctl status rc.local
reboot

If it doesn't work, check the service status with systemctl to see what went wrong.

@Eric-Katzfey Hi, how is this ticket going now?

@Eric-Katzfey said in how to stop wlan0 mac address randomization:

@shane_langhans Yes, this is a known issue. We have opened a support ticket with Qualcomm and are awaiting a solution.