Comment # 2 on bug 1193920 from Petr Vorel

NOTE: /boot/grub2/grub.cfg looks ok:

...
### BEGIN /etc/grub.d/10_linux ###
menuentry 'openSUSE Tumbleweed'  --class opensuse --class gnu-linux --class gnu
--class os $menuentry_id_option
'gnulinux-simple-e5a595f7-22ce-4f5d-ada2-5064ec644d70' {
        load_video
        set gfxpayload=keep
        insmod gzio
        insmod part_gpt
        insmod ext2
        search --no-floppy --fs-uuid --set=root
e5a595f7-22ce-4f5d-ada2-5064ec644d70
        echo    'Loading Linux 5.15.7-1-default ...'
        $linux  /boot/Image-5.15.7-1-default
root=UUID=e5a595f7-22ce-4f5d-ada2-5064ec644d70  loglevel=3 splash=silent
systemd.show_status=1 console=ttyS0,115200n8
        echo    'Loading initial ramdisk ...'
        $initrd /boot/initrd-5.15.7-1-default
}
submenu 'Advanced options for openSUSE Tumbleweed' --hotkey=1
$menuentry_id_option 'gnulinux-advanced-e5a595f7-22ce-4f5d-ada2-5064ec644d70' {
        menuentry 'openSUSE Tumbleweed, with Linux 5.15.7-1-default' --hotkey=2
--class opensuse --class gnu-linux --class gnu --class os $menuentry_id_option
'gnulinux-{
                load_video
                set gfxpayload=keep
                insmod gzio
                insmod part_gpt
                insmod ext2
                search --no-floppy --fs-uuid --set=root
e5a595f7-22ce-4f5d-ada2-5064ec644d70
                echo    'Loading Linux 5.15.7-1-default ...'
                $linux  /boot/Image-5.15.7-1-default
root=UUID=e5a595f7-22ce-4f5d-ada2-5064ec644d70  loglevel=3 splash=silent
systemd.show_status=1 console=ttyS0,115200n8
                echo    'Loading initial ramdisk ...'
                $initrd /boot/initrd-5.15.7-1-default
        }
        menuentry 'openSUSE Tumbleweed, with Linux 5.15.7-1-default (recovery
mode)' --hotkey=3 --class opensuse --class gnu-linux --class gnu --class os
$menuentry_id_o{
                load_video
                set gfxpayload=keep
                insmod gzio
                insmod part_gpt
                insmod ext2
                search --no-floppy --fs-uuid --set=root
e5a595f7-22ce-4f5d-ada2-5064ec644d70
                echo    'Loading Linux 5.15.7-1-default ...'
                $linux  /boot/Image-5.15.7-1-default
root=UUID=e5a595f7-22ce-4f5d-ada2-5064ec644d70
                echo    'Loading initial ramdisk ...'
                $initrd /boot/initrd-5.15.7-1-default
        }
}