How would that be a bug in the iso-image?
I have no idea. So far I have always only installed siduction on a hd and the last couple of years it (Grub) has always found all my other os on the computer, this time it fails and I don't know why.
This computer has exactly the same setup as before with siduction, this time the installer told me to create an efi partition, at first I didn't do it and installed anyway but then on boot it left me with grub rescue or whatever it is called, I installed again, made an efi partition in the beginning of the hd and then this happened. The only difference from before is a new iso and that I did change the former siduction partition to an efi partition and the rest as ext4.
So for me it's a bug or a regression or whatever.