We’ve seen many players complain about the Scarab Scouting quest in Azj-Kahet. Whether it was un-interactable dirt mounds, or just simply invisible ones, it wasn’t really possible to complete the quest. And considering the quest is required for 
Loremaster of Khaz Algar, it’s pretty relevant for a lot of players.
Blizzard have been working on a fix for a few days now:
And it seems that they’ve managed to get it done earlier today, as plenty of players have been reporting getting it done without any weird workarounds!
So, if you weren’t able to get the quest done now’s the time.