I have purchased 3x identical AX55 v1 routers and am attempting to set them up using ethernet backhaul. I installed beta firmware 1.2.6 Build 20231130 rel.74059(5553) on all 3, setup the first as the primary router, and then the other two one by one as satellite routers. 

It seems like it works as expected for about 5 seconds at a time, showing ethernet icons for the "connection" column of the Network Topology tab, but otherwise they are mostly either registering as "offline" or as the wireless connection with a single red bar. Even turning one of the satellite routers off yields a scenario where the remaining satellite router is connecting wirelessly instead of via hardwired ethernet.

I spent some time searching the forums, as well as looking through the 29 pages in the original beta thread , but I didn't see someone raise the particular scenario I'm encountering. 

When I first bought the routers, I had installed the latest production version (Archer AX55(US)_V1_1.2.6 Build 20231130) and set the 2 satelitte routers as Access Points. That seemed to work fine, so I'm wondering if the only option I have here is to go back to that setup. Having ethernet backhaul-enabled mesh seems like a great idea, but maybe it's just not ready for prime-time?

Edit 1: I should add that it not only cycles between wireless and wired, but also offline. It'd be nice to force disable wireless backhaul entirely, as the routers are far enough away that when this is enabled it totally wrecks the connection speed of any client.