I did the same thing yesterday using majestic leap and flying cloak (didn't even know that was possible) mid game, i killed myself right after using the little "tesla towers" on top of the buildings.
Sorry to say this but you are Lobby dodging and this is how it's meant to be, you are not meant to quit after the game has already started even if you are on the lobby and force people to go to the queue again. The game needs 3 characters to queue and you can put just 1 character was high...
+1 Happened to me on my first game today, tried exiting the game and coming back, but after that my game was missing textures and objetives wore invisible/missing.
Was playing my first game of the day after the update today, joined a match and after 3 min everything stopped moving on my game, but i could still talk with my team, after 30 seconds my game came back and i got to go back to lane, in the 7 minutes mark my game "freezes" again and this time i...