champ performance rate calculation bugged (there were no s a b and these stuff for my performance)

i were like 4/0/7 an i expect get s and because of that chest from my game but when game end the circle that show u (s, a, b) and these stuff was loading i w8 like 10 min and nothing happen so i press home and quite that lobby and after that i check match history and i see there was no rate in match history as well. pls fix that issue.