Comment 8 for bug 1960926

Oh, it looks like this is caused by this upstream mdadm change: https://git.kernel.org/pub/scm/utils/mdadm/mdadm.git/commit/?id=1a52f1fc0266d438c996789d4addbfac999a6139.

I guess the installer can't rely on udev for array memebership information and will have to run mdadm --detail or similar itself.