@alzhao - I have the same issue on “openwrt-mt1300-3.211-1227” firmware.
I put some useful info here: MAC clone with GL-MT1300 not working?
Where can I get “openwrt-mt1300-3.203-1012” firmware? Everything was working in the given testing firmware prior the update. The latest update crippled MAC clone feature and also 5 GHz guest Wi-Fi connection…
Thanks much!