I have to give up, but I assume it's partly due to that I use a Crusial P3 disk that do have a Phison controller.
For me, the hat (x1001) seem to be very sensitive for RF interferance. I got it more or less working without any Disk I/O errors by putting ALU Foil on the ribbon cable and removing the Pi from my GeekPI ALU case. Without the ALU foil or placing the pi in the ALU case, IO errors started all over the place, ending in a crash.
Thread on HASOS github on the issue:
https://github.com/home-assistant/operating-system/issues/3720#issuecomment-2531493387
I had to revert back to SDCARD...
