Offensive line plus some questionable reffing did them in.
All things considered though I think Bengals played a tough and gritty game, especially Burrow
Home field advantage is a real thing at Arrowhead. They were twice as loud as last year
The o-line and strange calls hurt them for sure. Still, that last drive was awful. I couldn't believe how the punter could give the Chiefs such a returnable kick. It might have been hard to see from the stands, but the hit on the last offensive play was clearly a penalty and imo dirty. Ossai crying like a woman after committing the penalty will be my lasting memory of that game. Not a good look.
On the bright side, I think the Bengals proved that last season's playoff run wasn't a fluke. They'll be tough next year.