Night Specific Mobs / NPCs?

Have been on a Knowledge grind recently & have noticed a recurring issue with NPCs & Mobs which are supposed to spawn between 22:00 & 07:00 are not appearing? Examples being Wicked Cultists & the Tarif Smuggler ( Epil Tanbu ).

Is this an issue for everyone, one that is known about, or that has the intention of being fixed? It'd be nice to be able to fill out the knowledge journal.

 

The Wicked Cultist have been asked and answered before, they do appear but do not stick around all night long they are usually only there for about a game hour or so between 22.00 and 23.00 (as far as I know) or it could be 23.00 to midnight. The smuggler in Tarif should be there since I have gotten the knowlege for him, could be a last patch problem or again a limited time he sticks around for.

Hope this helps