Uncompletable Zana mission (mission target did not spawn)

Ran my Zana daily today, Shipyard lvl 73, timed kill the corrupted monsters. Got the undead mod, so easymode since you get more time from monsters reraised by summoners. Cleared the majority of the map, including boss, with >2:00 left. Did two in-depth passes, checked /remaining when the mission "failed". 8 remaining, hadn't found any corrupted monsters. Stayed and found the 8 remaining, none of them were corrupted (6 magic zombies, 2 white skeletons).

The map did have 2 extra exiles mod, possibly the mission was supposed to be "Kill the rogue exiles" instead? Either that, or it just forgot to spawn the corrupted pack(s).

Not a huge deal, though it was disappointing since it should have been the final mission to max Zana. Just get it tomorrow I guess.

Mission map closed about 5 mins prior to this post if you wanna check the logs.