/remake just rekt me and Riot doesn't consider it "a bug"

Hello,

So here's the situation: I launch a ranked with 2 premades, one has picked for a random jungling dude and this jungling dude picked for him. But it seems like he dc'd because he wasn't there to make the trade. Game starts, the jungling random guy is actually dc'd. We wait in base for 3 minutes. I mention here that the random afk jungling dude came back at 2:15 or something near. So. This dude obviously doesn't want to "/remake" cause he's gonna lose LPs. But we stay in base till the 3:00 and we use the "/remake" command.

So the game ends and... Tadam ! Surprise ! -19 LP for me.

If it can help: no, my friends didn't lose LPs (we're platinum). So...

What the actual fuck ? I posted it in the "bug report" section but it was removed and I was told to post it here.

Can I have a rioter's explanation ? Cause if you don't consider it a bug well... I don't know. Lol. Better warn people ? oO