I would ask you one more thing.
In timeshift, I had 3 snapshots
Two scheduled and one created on demand (before system upgrade)
After upgrade, I wanted to delete the third snapshot. I couldn’t because nested snapshots
What I did:
I mounted subvolume that I wanted to delete to /mnt
from /mnt I deleted subvolumes portables and machines
I unmounted /mnt and then I was able to delete the subvolume created befotre system upgrade.
What I noticed.
After reboot when I do:
sudo btrfs subvolume list /
I don’t have subvolumes
I checked and in /var/lib there are directories portables and machines
So it seems that everything is exactly like before data migration. I’m happy but I don’t understand what happened. Why after reboot instead of subvolumes now there are directories.