Leaving game bug??

when your in champ select, and in the chat it says people join, in a lot of my games it says someone has left and when we get into the game they dont even move they're afk for the whole game, what im asking is. Is it a bug that the game doesnt quit the champ select and go back to match making or have they changed it now when someone leaves in champ select it still goes through to the game, because i know when they haven't choosen their champs it kicks everyone out but in the last 10 seconds before entering then they leave it doesnt quit anymore like it use to. is that a bug or a new thing put into the game??
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