Loss Prevented.

Haven't seen a loss prevented in so long that I forgot they exist.

-Play Thresh support (Ranked) -Have ADC afk 7-10 minutes around 9 minute mark -Large advantage to enemy team during this period -ADC comes back, isn't much use -Game lasts 44 minutes, we lose -Loss Prevented (No idea why)

Why is it that loss prevention isn't utilized in all AFK situations? Is their some scenario that I can't think of to effectively abuse it? Maybe only loss prevent games with an AFK before the 25 minute mark?