I myself was doing an organized crime den in Little China over near Metro: Farrier St, and when I cleared all of the enemies out the job didn't progress. I ran around the entire area looking for the last person because the combat indicator had went away and there was no one to be found. At some point I walked back into the area and heard what sounded like someone fighting so I went to investigate, and the sounds seemed to be coming from underground. My theory is that the enemy npc spawned...

[BUG] NCPD Hustle Break/Enemy NPC's Not Spawning Correctly