Quest [Hellfire Peninsula] The Cleansing Must be Stopped

[wizarddude]

WoW Freakz link: https://www.wow-freakz.com/quest_helper.php?quest=9370&&name=the-cleansing-must-be-stopped
Bug description: I fly to the Altar of Aggonar and then use the Signaling Gem, but the Draenei Anchorite NPC never spawns, so there is no way to complete this quest. The info page states that around 3800 people have completed this quest, but it never works for me. Maybe a recent game fix broke this quest? I'm trying to complete this quest on a Level 64 Blood Elf Mage. I tried abandoning the then re-accepting this quest, still the NPC never spawns at the Altar of Aggonar. I waited the full 2 minutes on the gem cooldown as well. Still no spawn.
Proof:

[dara89]

Same problem for me. Draenei didnt appear after gem using.
https://www.wowhead.com/quest=9370/the-cleansing-must-be-stopped#comments
https://www.wow-freakz.com/quest_helper.php?quest=9370&&name=the-cleansing-must-be-stopped
https://imgur.com/AGmWtev
https://imgur.com/ge5Skbu