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openSUSE Tumbleweed Now Defaults to GRUB2-BLS Bootloader for New UEFI Installs
So, if you have a modern computer using UEFI (not BIOS), the next time you install openSUSE Tumbleweed, the default bootloader will be automatically set by the YaST installer to GRUB2-BLS, which is needed if you want to install the system with full disk encryption (FDE) based on systemd.
GRUB2-BLS is a version of the GRUB2 bootloader patched by the Fedora project for compatibility with the Boot Loader Specification (BLS) for Type #1 boot entries, which are small text files stored in the /boot/efi/loader/entries folder. Future GRUB2 releases will include these patches by default.