browserify bundle() seems doesn't work properly with watchify 'update' event

[just4fun]

Below is my gulp task.

gulp.task('browserify', function() {
  var b = browserify({
    entries: [path.ENTRY_POINT],
    transform: [reactify],
    debug: true,
    cache: {}, packageCache: {}, fullPaths: false
  });

  var bundle = function () {
    return b.bundle()
      .pipe(source(path.OUTPUT))
      .pipe(gulp.dest(path.DEST))
      .pipe(browserSync.reload({stream: true}))
      .pipe(notify(function () {
        console.log('Bundled successfully!');
      }));
  };

  b = watchify(b);
  b.on('update', function () {
    console.log("Rebundle start...");
    bundle();
  });

  return bundle();
});

When I first run it, everything is OK. Then I changed something, such as change a text to first change, the update event is fired because Rebundle start... is displayed, but I can't see Bundled successfully! in console.

If I changed the text again to second change, then both of the two logs are displayed, but what I see in browser and my bundle file is first change.

I clone the gulp-starter and it has the same issue.

I'm using the browserify v9.0.6 and watchify v3.1.0, is there any usage wrong in the gulp task?

[just4fun]

I found the fix here, it was an issue about browserify. v9.0.7 works for me.