Banner of Command Needs a hotfix ASAP

The Banner of Command item on 8.11 has this new effect:

NEWDAMAGE REDUCTION - Now grants the affected minion 70% damage reduction from champions.

This stacks with the armor and mr the minion already had, so it makes a cannon minion which has around 100 mr/armor nearly un-killable. I just played a game where at 20 minutes, it took my entire team 10 seconds to kill a bannered-up cannon minion, and the enemy team eventually ended the game by double bannering a wave and just pushing down mid with no counter-play. There have already been games with 7,8 and even all 10 players in a game building it. It's in a game-breaking state at the moment, and the only real counter-play I see is for everyone to run the minion de-materializer rune, which I think is an absurd thing to force every person into that tree just to counter ONE oppressive item. Disable it, figure out a fix for it, or just remove it altogether as its use is extremely niche already. This is the worst game state I've seen league in over the 6 years I've played.