I had a working EOS system with btrfs, grub-btrfs, snapper, snap-pac installed so I could boot from old snapshots when problems arise.
However, this morning I installed plasma-wayland-session and on reboot I noticed that grub no longer had the EOS snapshot choice in the menu.
Before I mess with anything, I thought I’d seek advice in case this needs to be trouble shot.
sudo update-grub repairs the grub menu. (I have the AUR update-grub installed)