You may have spotted it, but mpv is broken in your image offering the 6.0.2 kernel.
It's a library version thing. This
Code:
ldd /usr/bin/mpv |grep found
throws up half a dozen libs. I presume there was issues or you wouldn't have re-released the image again.
I got the oversized screen sorted here on another video mode in X. It's coming up correctly sized for the initial output in a large font, and the first page of kernel output. Then a driver loads, and it goes offscreen. In X, 1920x1080 is over sized. When I switch to 1440x1080 (a 4:3 mode) I get a 16:9 mode with larger DPI.