Even if it did, KAST rewards you for performing Chron's special move (saving), which it absolutely should not. I recall there being some modified KAST stats around, idk if any of them did something about that. imo rounds that you survive and lose should just be removed when the equation for KAST, seeing as you had no impact; i.e. if you had a kill, assist etc. in 18/24 (75%) rounds, but you saved twice your KAST would instead be 16/22 (72%).