I choose hoplite as C3, but nothing happened. I can only see a quest call “A vessel for a spirit”. I dont think thats a job change quest…
Did you already have that quest before you choose hoplite C3 advancement as selection?
Cuase if you didn’t have it already then it’s no doubt the quest for it. Just try to do it and see if it will get you there.
EDIT: Nope that’s not the advancement at all
Do check your quests list, maybe it didn’t display outside of it to see for convenience
Just to confirm - the quest is not in the quest log(F5)? Because if you were already having 5 active quests on screen, getting a new one will only show up in there.
Yes you were right…the quest didnt display there…
Do post information all about this bug in the Gameplay Bug Report section so it could get its needed attention. This case is serious really, not to be ignored at all 
So, wasn’t it a bug at all? Or you still have it?