There is an issue with the phasing. The general mantid mobs spawn, but the three named NPCs do not.
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The most useful comment I found on wowhead comments was:-
If you’re doing this quest with flying unlocked, it seems that the named elites you have to kill don’t spawn unless you’re nearby and on the ground . I spent a good long while flying back and forth in the area and nothing was happening at all. As soon as I touched down near where they were supposed to be, they spawned.
Might be worth a try, another suggestion is getting an invite from someone on another realm/shard
This quest was not working as intended for my Mists of Pandaria: Remix character on Area 52. The smaller mantid were available, but the three larger spawns were not appearing. I tried logging out and back in, leaving the zone and reentering…I even waited for about an hour…nothing. Here’s the workaround I used to complete the quest. I used a newly created MoP: Remix toon on a low-pop role-playing realm (Argent Dawn in my case) to invite me to their realm. Once there, the three larger spawns were occurring regularly, and I was able to complete the quest easily.