There are a lot. There are the easy examples of Patriots v Falcons or the recent Jaguars vs Chargers.
However, those are examples that mirror the score and there are better examples of a mindblowing concept: when the offense is struggling the defense is not required to give up points. The 49ers did not give up 28 points in the first half when Purdy struggled against the Packers (they did give up 24 when he struggled against Detroit but they again they stepped up in the second half). Lamar Jackson looked awful until the last drive of the first half against Houston and the defense only gave up 10 points in that half, because the defense understood that they are not required to be terrible when the offense is off.
The Cowboys defense had a fundamental problem in that if the offense could not start hot and get a lead they could not play. They were AWFUL if the option of running the ball existed. Unfortunately in the playoffs you cant win if you have such a glaring flaw. That just is not going to happen. Its the same reason the Ravens have struggled in the playoffs as you are not always going to be ahead.