Similar issue. Bought and used One Hero's journey for Dragoon - to lvl80. I am now playing a Reaper through the Shadowbringers MSQ. I have the red quest markers for the tank, healer, and Magical DPS roles - and I can see the quest givers. However, there is no quest marker for the Physical DPS quest, and Lue-Reeq is invisible. I see the spot where he is supposed to be (I see people standing there around where he should be).