The main reason for installing garage door sensor is that sensors work as the safety purpose for your door which will protect against injury or be damaging to the property. A sensor detects the objects in the way of the closing the door.
Seen the exact same thing a couple weeks ago. I figure either they couldnt get them aligned correctly or damaged the wire and just pulled them back to where the wire would reach. Either way, its certainly seemed like a lazy jimmy rig. Just called it out and moved on.