Ah! I think I've got it! It's very possible that the 'extra' strut is a safety locking strut, to prevent the doors closing and the system operating should the hydraulic strut loose pressure. Similar 'locks' are often fitted to the oleos on static exhibits, to prevent the aircraft settling if the oles leak. Very often, but not always, these are painted red.
I think the opposite door is actuated by the remote strut, just visible on the right, forward of the main strut mounting location.