Ineligible due to Client Bug

I was counted as ineligible to earn rewards from a match "due to afk behavior", after spending 6 minutes of re-launching the League client when it failed to load me into the match. After Champion select, the client went to a "Game in Progress" screen and never loaded my actual match. I restarted the client numerous times, even in Administrator mode, and it would kept repeating the "Game in Progress" message without loading my match. I had to restart my entire PC before the match would load upon logging in. I participated in the match fully and completely, my team mates having covered my lane until I got back, and I quickly made a come back. Despite my efforts though, the client punished me. I had equal damage done to enemy Champions as our ADC, had claimed 5 kills and was there for every team engage. A bunch of random PUGs chose to support me by not Remaking, we stuck out a 20+ minute match, and the client completely benched me.

I'm concerned about the mark on my record, seeing as how the client arbitrarily decides when a client crash is or isn't punishable.