Systemd boot doesn't show old generations anymore

[nixinator]

Nixos-rebuild does not update Grub generation list

Usually this happens when /boot is not mounted as you expect. If the “wrong” /boot is in place, then NixOS will generate the new boot loader config and install it to the wrong place. This can happen if you have multiple ESPs and mount the wrong one, or, if you simply messed up your /boot mount and the writes are just falling through to / which isn’t being considered by the bootloader. I just realized that if I boot from the other EFI boot, then it catches the right generation of nixOS. For th…

may shed some light on it, however it may be unrelated as i’ve not updated to flakes yet…

are you sure that older generations are not getting garbage collected in some way, leading to older generations to be removed?