When I first installed my Joomla 3.x website, I uninstalled the default Joomla templates: Beez3, Protostar, Hathor, Isis.

Every time I upgrade to a new Joomla version, Joomla appears to reinstall these templates back into the /templates/ & /administrator/templates/ folder. Furthermore, they don't get recognized and appear back in the administrator panel, they can only be seen from a file manager.

How can I prevent Joomla from reinstalling these directories every time I update my Joomla version?