Just a fair warning for anyone who hasn't made it that far in the game yet. If you die or retry after picking up the Stun Grenade blueprint in the Lingua Franca episode it doesn't respawn so make absolutely sure you completely clear out the area before you pick it up. For everyone else I guess we're fucked on 100%'ing the game until they patch it unless you want to restart your save file (which I might actually wind up doing because the game is that fun). The bigger bummer is that Stun Grenades are ridiculously useful and being able to carry around 12 would be awesome. I'm pretty sure this impacts all versions of the game but it might just be PS4 and PC.