Confirm this problem with qemu 6.1
https://wiki.qemu.org/ChangeLog/6.1
Section: Incompatible changes
When creating an image with a backing file, or changing the backing file
of an existing image, qemu-img requires now that the backing file format
is specified as well.
with qemu 6.0 works
Package: libguestfs-tools
Version: 1:1.44.1-2
Severity: important
virt-sparsify in.qcow2 out.qcow2 now is broken:
debugging it gives:
libguestfs: trace: disk_create "/tmp/sparsify4e60f4.qcow2" "qcow2" -1
"backingfile:/var/lib/libvirt/images/FujitsuWin10v2.qcow2" "compat:1.1"
libguestfs:
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