Yeah, this is the bug I was talking about in another thread here recently XD, as it is now, you can avoid it by crossing the threshold to trigger party reunion with vera and not vahn...tho I wasn't aware it also unlocked characters... is it Adder and or Lyric? it could have been due to how the additional characters are checked for(base game uses seperate pages, with my moded version I condensed it into a single if/else tree lol)