Do have the luxury of trying different headsets? (Turtle Beach vs. basic XB chat-mic vs. phone earbuds+mic). Clearly it’s not your hardware, but perhaps there’s something in the game code now that has issues with separating voice from game sounds. ie; basic chat-mic only has voice-chat coming through earphones leaving game sounds coming out of your TV speakers, where a Turtle Beach or earbuds have EVERYTHING coming through the earphones... something worth trying I suppose.