Unknown filesystem

[balanga]

1. upload your ventoy_grub.cfg here
2. In Ventoy boot menu,  press c to enter grub shell  and  run ls -l and upload the result (picture) here

Can I save the output to a file?

For partition 9 it says:-

Partition hd0,gpt9: No known filesystem detected -
Partition start at 223237120KiB - Total size 10485760KiB

This is actually a 10GB ext4 partition with exactly the same contents as partition 8 which boots without problem, and can be mounted normally from part 8 and everything looks fine.

I also have parts 10 and 11 and they boot fine.