On reboot after Windows install, I think it tries to update the BCD so it looks for original BCD and modifies it. If it cannot find original BCD on original boot disk in 'expected' state then it errors.
Did you use VHDX?
Limitations
Native VHXD disk management support can attach approximately 512 VHDX files concurrently.
Native VHDX boot does not support hibernation of the system, although sleep mode is supported.
VHDX files cannot be nested in other VHDX files.
Native VHDX boot is not supported over Server Message Block (SMB) shares.
Windows BitLocker Drive Encryption cannot be used to encrypt the host volume that contains VHDX files that are used for native VHDX boot, and BitLocker cannot be used on volumes that are contained inside a VHD.
The parent partition of a VHDX file cannot be part of a volume snapshot.
An attached VHDX can't be a dynamic disk. A dynamic disk provides features that basic disks do not, such as the ability to create volumes that span multiple disks (spanned and striped volumes), and the ability to create fault-tolerant volumes (mirrored and RAID-5 volumes). All volumes on dynamic disks are known as dynamic volumes.
The parent volume of the VHDX cannot be configured as a dynamic disk. Store the VHDX on a basic disk.
https://docs.microsoft.com/en-us/windows...ative-boot
Did you use VHDX?
Limitations
Native VHXD disk management support can attach approximately 512 VHDX files concurrently.
Native VHDX boot does not support hibernation of the system, although sleep mode is supported.
VHDX files cannot be nested in other VHDX files.
Native VHDX boot is not supported over Server Message Block (SMB) shares.
Windows BitLocker Drive Encryption cannot be used to encrypt the host volume that contains VHDX files that are used for native VHDX boot, and BitLocker cannot be used on volumes that are contained inside a VHD.
The parent partition of a VHDX file cannot be part of a volume snapshot.
An attached VHDX can't be a dynamic disk. A dynamic disk provides features that basic disks do not, such as the ability to create volumes that span multiple disks (spanned and striped volumes), and the ability to create fault-tolerant volumes (mirrored and RAID-5 volumes). All volumes on dynamic disks are known as dynamic volumes.
The parent volume of the VHDX cannot be configured as a dynamic disk. Store the VHDX on a basic disk.
https://docs.microsoft.com/en-us/windows...ative-boot