UEFI instance snapshot error #13547

The problem still exists independent on the version of libvirt. I tried libvirt 11.10.0

The issue is the format of the nvram disk file. I converted it from raw to qcow2 and can now take snapshots with memory of VMs with UEFI.

Here are my changes in the XML config:
from:
<nvram template='/usr/share/edk2/ovmf/OVMF_VARS.secboot.fd' templateFormat='raw' format='**raw**'>/var/lib/libvirt/qemu/nvram/a5b15197-6388-4bc8-a4f4-c446d28fde7c.fd</nvram>
to:
<nvram template='/usr/share/edk2/ovmf/OVMF_VARS.secboot.fd' templateFormat='raw' format='**qcow2**'>/var/lib/libvirt/qemu/nvram/a5b15197-6388-4bc8-a4f4-c446d28fde7c.**qcow2**.fd</nvram>

Originally posted by @ingox in #12427 (comment)