You may have overwritten your Grub configuration from the snapshot somehow. If you boot to the live ISO, mount the correct subvolumes in a chroot, reinstall Grub, and regenerate the Grub configuration file, that may get you back on track.
This process is detailed here:
If you do not explicitly mount @ at / (for example you use the chroot tool), make sure the @ is being mounted and not another subvolume before you begin.
Keep in mind, if this works you may be booting to a system that is very out of date. Be sure to update with the garuda-update script to avoid having to deal with package conflicts and other interventions.