Unfortunatly, I will not be able to help you further. I still haven't moved mines RT3200 to kernel 6.1. I belive that @hnyman and @daniel can help you further - sorry guys to pin you.
Also please follow the RT3200 topic under the development section of the forum https://forum.openwrt.org/t/belkin-rt3200-linksys-e8450-wifi-ax-discussion/94302.
Good luck!
Kr
K