mask of the revenant bugged

[Saintmythi]

so i been working on this quest and have made 2 parts of rev. now i go back to the plains to touch the arm and rev's ghost shows up to be killed and drop the blueprint. yet i have done this now 5 times on 2 different nights, yet every time i kill him the dialog does not start and i do not get the blueprint. i have now watched 2 you-tube videos and it is not working. why is it after you put a stupid ship battle into the game more and more bugs are happening? the plains have been messed up for days now yesterday i had to do the 2nd part of the sortie 4 times just to get it finally done. when i try to work on the kuva fortress and que for a mission my screen just turns black and i have to relog. so many bugs preventing me from getting this stuff done so i can move onto the next thing.