Timeshift fails restoring snapshots

Hi, I am a developer which uses Timeshift to backup my system.

I discovered that it cannot restore properly snaps, which simply does not start after restoring.

I documented this issue at https://github.com/linuxmint/timeshift/issues/179 and https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/1900326 .

Could somebody tell which is the right way to backing up/restoring snaps by rsync.

Said that, I would write a pull request to fixup Timeshift.

Thank you so much in advance!