I've rebased all my snapshots using '-F' and now everything boots
properly.
Thank you.
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https://bugs.launchpad.net/bugs/1857143
Title:
VMs won't boot from external snapshots on qemu 4
Public bug reported:
After upgrading from qemu 4.1.1-1 to 4.2.0-1, VMs that were set to use
an external snapshot as their disk failed to boot.
Depending on the guest OS and other VM settings the boot fails and you
get either the "Boot failed: not a bootable drive" message or the grub
rescue shell
