Ubuntu 17.10 network-manager ingores and overwrites clonned MAC

[George]

I have installed
network-manager (1.8.4-1ubuntu3) artful;
network-manager-gnome (1.8.4-1ubuntu1) artful;

Also I'm running Ubuntu 17.10 with Xorg.

Problem 1
From GUI Wired Settings I can't set Cloned MAC Address.
I'm forced to set it manually changing config file with cloned-mac-address that I need.
/etc/NetworkManager/system-connections/wiredcon

Problem 2
After second reboot for some reason Network Manager overwrites my cloned-mac-address with defaults NIC address and I can't connect to the Internet, because I need my MAC that I set before.

I have participially solved problem by disabling 'connect automatically' in Wired Settings and after system reboot cloned-mac-address is saved with what I need and it is not changed and I have connected to Internet.

Problem 3
If I turn on again 'connect automatically' in Wired Settings the cloned-mac-address is overwritten
again by default NIC address and I can't connect to Internet.

So I can't change MAC address from GUI interface and I can't use Internet auto connect option.