ecrypting image file breaks efi/boot of the guest/Ubuntu - ?

Hi guys. I've have a guest and that guest differs from all other guest by:   <os>     <type arch='x86_64' machine='pc-q35-rhel9.0.0'>hvm</type>     <loader readonly='yes' secure='yes' type='pflash'>/usr/share/edk2/ovmf/OVMF_CODE.secboot.fd</loader> <nvram>/var/lib/libvirt/qemu/nvram/ubusrv1_VARS.fd</nvram>     <boot dev='hd'/>     <bootmenu enable='yes'/>   </os> whereas everything else has:   <os>     <type arch='x86_64' machine='pc-q35-rhel9.0.0'>hvm</type>     <boot dev='hd'/>     <boot dev='cdrom'/>     <bootmenu enable='yes'/>   </os> Now, that different guest fails - as the only one - to start, to boot after its qcow2 image was luks-encrypted. Guest starts but says that: BdsDxe: failed to load Boot0001 "Uefi Misc Device" from PciRoot (0x0)/Pci(0x2,0x3)/Pci(0x0,0x0): Not found revert back to original, non-encrypted qcow2 image and all works a ok. All and any thoughts shared are much appreciated. many thanks, L.