[Global] Ranked: LP: System removes LP from players from a loss even if players have left the match.

Environment: Live Region: Global Build: 5.5.15_03_09_13_59

Steps to Reproduce: 1.) Boot client and using a level 30 account, select Play > PVP > Classic > Summoner's Rift 5v5 > Ranked Solo/Duo > Match Me With Teammates 2.) When prompted, select to join game. 3.) If first pick, ban any three champions when prompted. 4.) When prompted, select any champion. 5.) Load any game and play as normal. Watch for other players disconnecting. 6.) If step 5 occurs, wait for end of game and check the End of Match details for loss of LP.

Bug: System removes LP from players from a loss even if players have left the match. Reproduction rate: 100%

Expected Result: In the ranked environment, if players are AFK for more than 5 minutes total time, the game is immediately ended and no LP is lost or won for the players who remained connected. Players who left take an LP loss equivalent of 2 games. (Demotion possible.)

Comments: Tested on every build since beta, and the issue has existed forever. This shouldn't be regarded as Known Shippable. Screenshot attached.