The problem is in TransitionAnchor.

In the onClick event it stops the propagation and then bootstrap don't receive the click event to close the dropdown menu.

  @Override

   public void onClick(ClickEvent event) {

     if (isEnabled())

       navigation.goTo(toPageWidgetType, this.state);

    event.stopPropagation();

     event.preventDefault();

   }

So, if someone in Errai can confirm this ...