Can't find /boot/grub/grub.cfg

[IvanDSM]

Description

A GRUB config file is present at /boot/grub/grub.cfg, but isn't detected by kexec-reboot.

Environment

Kernel: 5.17.12-gentoo-dist
Ruby: ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x86_64-linux]
GRUB: 2.06
kexec-config: commit 5010c09.

Sample output

Eldorado /home/ivan # file /boot/grub/grub.cfg 
/boot/grub/grub.cfg: ASCII text
Eldorado /home/ivan # head -8 /boot/grub/grub.cfg 
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
Eldorado /home/ivan # kexec-reboot -lv
Couldn't find a grub configuration anywhere!