GL-MT300N-V2, change mac address not working

I have three GL-MT300N-V2 routers. I cant get the mac address clone feature working on any. I am attempting to change the address to a specific mac address. I hit apply > I get a confirmation message that it was applied.

The setting never actually saves. I have the router in repeat mode, updated to the newest version.

Any advice? I am comfortable with SSH, coding, etc…

Do you have LuCI installed? This will also help.

What is the firmware version you are using?

Can you try firmware 3.215?