The mission Short Circuit doesn’t cleanly reset itself if you pause the mission while still in the area. Here’s the steps to repeat:
- Pick up Short Circuit
 - Click the Suspicious Cyborg. It explodes.
 - Pause the mission
 - Wait. Forever. It never comes back.
 - Have a friend show up. He can see the Cyborg and he can complete the mission normally. It’s still not back for you.
 - Continue waiting. Forever. It never comes back.
 - Pause the mission
 - Port out of the zone
 - Come back. The Cyborg is finally back again
 
So there you go. If you accidentally pause the mission like I did while standing in the area then you’re locked out of it until you leave the zone and come back.