I know this kinda makes sense with ND being a non-football member in the ACC, but I don't know if I've ever seen a 12 game series scheduled like this.
https://fbschedules.com/clemson-notre-dame-schedule-12-game-football-series-beginning-in-2027/
https://fbschedules.com/clemson-notre-dame-schedule-12-game-football-series-beginning-in-2027/