Reconnected to game at 4:30, played for the remaining 36 minutes= Leaver.
My internet crashed at the beginning, but I reconnected at 4:30 after my team (premades) didn't get the option to remake. Regardless of the tilting start, I played out the 41 minute-long game, but ended up getting marked as a leaver. Even ended a higher level than two of my teammates. If this was ranked, even if I reconnected at the 4th minute and won the game after 40 minutes, I'd have lost LP and gotten leaver.
Is there really any point in reconnecting? Riot needs to work on their system.