I am in Nazjatar and currently on the part where I need to complete the 3 quests with my chosen Ally. Well, only 2 of the 3 quests are in the guide, the 3rd quest says that it is not yet in your guide? Weird how the first 2 are but the 3rd one is not. I have linked the quest below that is missing from the guide.

https://www.wowhead.com/quest=55662/arcane-cache