Make legacy bootable unmounts bootcamp

I restored an img with winclone 8 on my iMac late 2012 with catalina.
Yesterday after many attempts of making legacy bootable at the end I did it and could enter in windows.
Today I restored again the same image and couldn’t again make legacy bootable.
I noticed that when I click “Are you sure you make BOOTCAMP Legacy Bootable?” soon Bootcamp is Unmonted and nothing happens.

Does the Winclone log show any errors?

I did another restore and this time everything went well.