Hi, so this is probably gonna sound ridiculous but I've accidentally made an internal drophack. Basically, you need to play ryze <gonna see soon if it works for other champions too> and you need to have both Q/E, then you simply select the "Drophack" option from a menu and stay at base, it's gonna lag everyone in the game, if you let it stay this way for like 5-10 minutes the game is gonna disappear and it won't be in your match history.
I can show how it works through sharescreen, if you're interested hmu on my discord, Bumek#0396
Proof that it works: