Ah, I was misreading my results. That patch does solve this bug. The remaining problem was that the snapshot was failing due to apparmor constraints. When the apparmor policy is re-calculated to add the permissions to the new snapshot, the permission to the underlying disk is removed. (I worked around it by adding /var/lib/libvirt/images/** rw to /etc/apparmor.d/libvirt/TEMPLATE)
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