@florent Ubuntu LVM file restore is working! (commit 38931)
Now for another important issue I noticed with file restore (not directly LVM).
Symbolic links don't show up. They should be restorable alone, but more importantly you need to be able to see and follow them for directories.
For example. In Ubuntu, /bin is a link to /usr/bin. It is important to be able to click on /bin as a link to /usr/bin so files can be found in the backup. Another example is /vmlinuz that is a link to boot/vmlinuz-5.10.0-44-amd64. At worst the file restore should show a link (and it's destination), even if I can't restore the link. This is not just a LVM issue.