Comment 2 for bug 713258

Found it in bzrlib.commands.py:

        try:
            return self.run(**all_cmd_args)
        finally:
            # reset it, so that other commands run in the same process won't
            # inherit state
            trace.set_verbosity_level(0)

That final set_verbosity_level(0) resets the _progress_view state, and it happens *before* we fall all the way back out to main() to decide that we want to log how many bytes are transferred.