There are 2 quests in Gateway. One to kill during the day, one to kill at night. Well at 22:00 game time, the day time kritters are still up and the night time ones don’t spawn.
What is is the bug?
“Night” starts at different times for different quests.
In this case at 00:00. Goes along with the ghost-theme pretty well. I am confident you can finish this quest if you just wait a little longer.
22:00 is 10pm. I would wait until after midnight, I know it’s frustrating - I remember waiting and waiting for the time. It might be after midnight, I don’t recall what hour the night begins for the quest.
Edit: as Kantakwa said, I think it is 0:00.