Also impacts GRUB 2.12-1-~bpo12+1.
- Bug#1103709: grub-pc: Failure to boot missing Windows disk... Richard Allen
- Bug#1103709: 2.12 test Richard Allen
- Bug#1103709: grub-pc: Failure to boot missing Windows... Pascal Hambourg
Also impacts GRUB 2.12-1-~bpo12+1.