power outage mid ranked game, reconnected and won still lost LP

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my power went out for a split second ~20 minutes into the game, i reconnected ~25 minutes and preceded to win at ~30 minutes. I was marked as a "leaver" and "You are ineligible to earn loot due to leaving or AFK behaviors." was the first thing i saw in chat box. I was not toxic, i won my lane, had 15k damage to objectives and 5k to turrets. how do i go about not losing this LP? the rewards i do not care for as its not a big deal but the LP is upsetting as I had won.
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