All's well that ... {oh, you know the story} ....


FWIW, I've cloned and upgraded original boot drives on a LOT of systems.
I've never had the problem until recently.
I will usually upgrade the SSD and take the original to use a a backup drive.
Easiest way is to reboot with both drives attached and format the original drive.
Even with the BIOS set to boot to the new drive the secondary will be seen in BIOS and not in the Windows GUI.
It surprised me too and why now?
Solution was to add the drive with a USB to SATA cable or to reformat in another machine.

A couple of links from Acronis Support Forum:

https://forum.acronis.com/foru...after-creating-clone

https://forum.acronis.com/foru...t-cloning-how-not-do

I usually get stubborn when I see a new problem like this to know all the parameters and try to recreate the issue but haven't had any computers to test recently but this solution seems very plausible.

Glad everything is A-OK now.