Rclone never uses absolute paths!
The paths are always relative to the root of a backend.
So if you are doing
rclone copy drive:folder /path/to/folder
Then rclone creates a backend drive: with a root of folder and a backend local with a root of /path/to/folder and uses paths relative to those two roots.
It doesn't really make sense for rclone to log absolute paths as when it is copying from A to B the relative paths to the root are the only thing that matters.
It isn't straight forward to add absolute paths to all logging as rclone doesn't use them. Probably the best thing you could do would be to modify the local backend - modify this function to return the full path and then at least local backend paths would print out in full