Thanks for finding it! I fixed it.
It's because for the cutscene with Luca the time will be set to day but it not removes the check for the event night monsters to disappear.
I added a check now to cutscene triggers that change the time to day.
Will be fixed in the next version.
Also the game will correct this mistake once you went to any sleeping spot an use it. It's not game breaking in anyway and only should apply to this quest.