MAC address override will not save (Asus RT-AC58U)

Hello, folks
I have installed the latest release onto ASUS-RT-AC58U(the original, with USB 3.0 port). Sadly I have faced a strange issue overriding MAC address for WAN/Dynamic DHCP interface. Any new MAC address I put into the "Override MAC address" cell will not save. I tested it with 19.07.2 and 18.06.8 - the same behavior. For the sake of speed I called my provider and asked to register the new MAC but the question remains why. Is it an issue for this ASUS router or a bug in the release? I would appreciate if somebody would shed some light on it. Thanks.

Try (if want is eth0.2):

config device 'wan_dev'
	option name 'eth0.2'
	option macaddr 'xx:xx:xx:xx:xx:xx'

That's a bridge config on the web GUI.

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See /etc/config/network, macaddress could be inserted in device, or interface, format is common: option macaddr 'XX:XX:XX:XX:XX:XX'