How can Timeshift rsync snapshots appears in boot? (BTRFS)

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Looks good.

Yes, it’s UEFI boot. I installed Manjaro with UEFI.
I add a partition of fat 32, /boot/efi.
And when I did:

$ sudo grub-install
[sudo] password for sergio:
Installing for x86_64-efi platform.
Installation completed. No errors reported.