In your bisync command, your Path1 is:
~/Documents/rclone
but in your --resync log it is:
/home/nimby/Documents/rclone
I realize that the first is likely an alias for the second, but I'm not sure if bisync realizes that. If I'm right, it is creating a listing file during --resync that it is unable to find later because the path has changed. (Bisync uses the path for the session name in the listing filename.) I think either version should work, as long as you pick one and use it consistently.
I think this is because the ampersand (&) shouldn't be there. Try removing it?