I flashed about 20 times different images and different devices. The biggest challenge was the soft brick with a Zyxel NBG6817, which is very similar to the R7800, but not with debricking! 1st flash with the Zyxel was without problems, then I added packages for mesh and the device was bricked.
What I have learned, that it got a lot better with beamforming from Openwrt 22 to 23 with Wifi 6(!) devices. Maybe the R7800 with Wifi 5 needs the next Openwrt 24? See what changed here from 22 to 23:
Thanks, I would be interested in the changes from WDS to Mesh. Your WDS looks similar to mine.