I have also encountered this a lot recently. I have been playing through my second character human with a missing sister. I have found that the first line of almost every mission for the last 5 or so missions has missing VO.
I’ll check the names of the missions when I get back from work.
I was wondering if anyone else had encountered this as well. This, for me is a horrible horrible bug, worse than a mission not working.
I have played through the story and got the same broken issue with the orb and Apatia being introduced out of nowhere but as if I had known about them all along. Since personal stories are one time only missions my characters personal storyline has been permanently and un-reversibly broken.
Extremely disappointed and have pretty much lost all interest in completing the rest of the story on this character.