Void Linux BIOS模式下grub-mkconfig无法生成/etc/grub.d/10_linux对应菜单项问题求助

我正在编写一个比官方void-installer更精细化的Void Linux安装脚本，UEFI模式下安装GRUB完全没问题，但BIOS模式（传统引导）下遇到了头疼的问题：

grub-install /dev/sda执行正常，但grub-mkconfig -o /boot/grub/grub.cfg生成的配置里完全没有Void的启动菜单项——本该由/etc/grub.d/10_linux生成的内容是空的，我确认这个脚本文件确实存在。

我怀疑是在chroot环境下执行grub-mkconfig导致的问题？毕竟UEFI模式下的grub-install --target=x86_64-efi --efi-directory=/efi --bootloader-id="Void"能正常工作，可能是UEFI的引导机制和BIOS不一样？

下面是我脚本里负责安装引导加载器的函数：

install_bootloader() {

display_logo

echo "------------------------------------"
echo "(8) Install bootloader"
echo "------------------------------------"

read -p "Enter system architecture (x86_64|aarch64): " arch
exit_if_0 $arch

read -p "Enter system disk (e.g. /dev/sda): " disk
exit_if_0 $disk

read -p "Enter boot partition (e.g. /dev/sda1: " boot_partition
exit_if_0 $boot_partition

read -p "Enter boot partition scheme (boot|efi): " boot_scheme
exit_if_0 $boot_scheme

read -p "Enter root partition (e.g. /dev/sda2): " root_partition
exit_if_0 $root_partition

if [[ $boot_scheme == "efi" ]]; then
    if [[ $arch == "x86_64" ]]; then
        xbps-install grub-$arch-efi
    elif [[ $arch == "aarch64" ]]; then
        xbps-install grub-arm64-efi
    fi
fi

if [[ $boot_scheme == "efi" ]]; then
    mkdir -p /efi
    mount -o rw,noatime $boot_partition /efi
    if [[ $arch == "x86_64" ]]; then
        grub-install --target=$arch-efi --efi-directory=/efi --bootloader-id="Void"
    elif [[ $arch == "aarch64" ]]; then
        grub-install --target=arm64-efi --efi-directory=/efi --bootloader-id="Void"
    fi
elif [[ $boot_scheme == "boot" ]]; then
    mount -o rw,noatime $boot_partition /boot
    mkdir -p /boot/grub
    grub-install $disk
    sleep 3
    grub-mkconfig -o /boot/grub/grub.cfg
    sleep 3
fi

clear

}

生成的/boot/grub/grub.cfg内容如下（重点看10_linux对应的区块是空的）：

#
# 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 ###
if [ -s $prefix/grubenv ]; then
  load_env
fi
if [ "${next_entry}" ] ; then
  set default="${next_entry}"
  set next_entry=
  save_env next_entry
  set boot_once=true
else
  set default="0"
fi

if [ x"${feature_menuentry_id}" = xy ]; then
  menuentry_id_option="--id"
else
  menuentry_id_option=""
fi

export menuentry_id_option

if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function load_video {
  if [ x$feature_all_video_module = xy ]; then
    insmod all_video
  else
    insmod efi_gop
    insmod efi_uga
    insmod ieee1275_fb
    insmod vbe
    insmod vga
    insmod video_bochs
    insmod video_cirrus
  fi
}

if [ x$feature_default_font_path = xy ] ; then
   font=unicode
else
  insmod part_msdos
  insmod ext2
  set root='hd0,msdos2'
  if [ x$feature_platform_search_hint = xy ]; then
    search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos2 --hint-efi=hd0,msdos2 --hint-baremetal=ahci0,msdos2  446e6032-9198-4f85-aa98-252abfadbecb
  else
    search --no-floppy --fs-uuid --set=root 446e6032-9198-4f85-aa98-252abfadbecb
  fi
  font="/usr/share/grub/unicode.pf2"
fi

if loadfont $font ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  set locale_dir=$prefix/locale
  set lang=en_US
  insmod gettext
fi
terminal_output gfxterm

if [ x$feature_timeout_style = xy ] ; then
  set timeout_style=menu
  set timeout=5
  # Fallback normal timeout code in case the timeout_style feature is
  # unavailable.
else
  set timeout=5
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/10_linux ###
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/30_uefi-firmware ###
### END /etc/grub.d/30_uefi-firmware ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  ${config_directory}/custom.cfg ]; then
  source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg
fi
### END /etc/grub.d/41_custom ###

有没有大佬知道问题出在哪？提前感谢！

备注：内容来源于stack exchange，提问作者SammySP