Verify GRUB_DISABLE_RECOVERY Set to true
multi_platform_all
GRUB_DISABLE_RECOVERY set to 'true' in
/etc/default/grub
{{%- if 'ubuntu' in product %}}
^/etc/default/grub(\.d/[^/]+\.cfg)?$
{{%- else %}}
/etc/default/grub
{{%- endif %}}
^\s*GRUB_DISABLE_RECOVERY=(.*)$
1
^(true|"true")$