25.0.9 cannot be installed on non-EFI, but Calamares pretends and fails

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@fredvej please try the following on your new ISO:

sudo pacman -U https://download.manjaro.org/pkgs/calamares/calamares-3.4.0-3-x86_64.pkg.tar.zst
sudo calamares -D6

I tested it on the GNOME 25.0.9 ISO using VirtualBox in BIOS mode.