I’ve added a workaround for the main issue we are facing here. This way grub doesn’t need to been updated on MBR/EFI. Simply a package update of the grub package is enough. update-grub script will handle the issue with the dashes: https://gitlab.manjaro.org/packages/core/grub/-/commit/6eca32e6b0cf9cd948bf6718a19de704ebaae5f5
sudo pacman -U https://mirror.easyname.at/manjaro/pool/overlay/grub-2.06.r456.g65bc45963-6-x86_64.pkg.tar.zst
It would be good if people who already have updated via grub-install ... to 2.06-r456 on MBR/EFI to check if still all works.