I can confirm exactly the same issue on Arch linux running qemu-4.1.0.
After downgrading from 4.1.0 => 4.0.0 everything is running normal again, no corruption detected and all qcow2 images stays healthy.
I can confirm exactly the same issue on Arch linux running qemu-4.1.0.
After downgrading from 4.1.0 => 4.0.0 everything is running normal again, no corruption detected and all qcow2 images stays healthy.