Follow-up Comment #4, bug #39306 (project grub):
BTW, looking at various grub.cfg files on my own systems, it looks like it's
only the 10_linux, 20_linux_xen, and 30_uefi-firmware scripts that generate a
$menuentry_id_option for each menuentry.
Other grub.d scripts (e.g. 30_os-prober, 20_ipxe, and others) don't generate
them.
Since they're optional, it doesn't seem possible to rely on them being
present.
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