Comment 2 for bug 1962057

I have the same issue after migrating LMDE from 4 to 5. I now have several (4 to 5) entries for LMDE 5 (flagged as "from os-prober") and even when I remove all but one, customize keeps bringing them all back.
PS: I run customizer from openSUSE Leap 15.3
PS2: For whatever reason, I have several "nn_os-prober_proxy in my openSuse's /etc/grub.d/ directory, nn being 10, 11 and 12)