✓ Confirmed - After deleting the “offending file” list-broken-files and purge-broken-files fixed the situation and running new backup set fixed the problem.
Now restore doesn’t report the path error anymore either.
But this just proves the point that the logic is still inherently broken and requires manual tinkering every now and then. - Which is of course something what normal users never do and then they’ll end up with broken and unrestorable backups.