23.05.3->.5 attended sysupgrade on VirtualBox x86_64 VM - lost boot

All I have now is:

BdsDxe: failed to load Boot0002 "UEFI BOX HARDDISKUB63851668-5eb14272 " from PciRoot (0x0) /Pci (0×D, 0x0) /Sata (0x0,0xFFFF,0x0) :
Not Found
BdsDxe: No bootable option or device was found.
Press any key to enter the boot Manager Menu

Has anyone else experienced?

Not a big deal, but... unexpected.