I've already gone through the Khvostov questline and earned my exotic. However, for those characters that haven't gotten that schematic from that chest are not given a chance to start it to acquire the quest and mission. I figured it is just an annoying bug in the way. But I really want to get the schematics just to see that mission selection on the Cosmodrome map. I go back to the Ketch every time and even after finishing all of Rise of Iron quests and missions. Still, nothing out of that chest. I don't particularly expect other characters to be out of question for the options of starting the questline. I want to see what other people on the forums would like to say in this regard. Help a brother out and comment your experience. And if you've come back after reading this and trying it out for yourself, do you think my argument is valid?