He was a disaster. And it is no coincidence that Real Madrid went from being embarrassed by PSG when Asensio was on the pitch in the first leg and in the first half of the second leg to eventually turning the tide in the second half of the second leg with the more active Rodrygo Goes on the pitch for him.
As if that weren't enough, Ancelotti actually went back to Asensio over Rodrygo against Celta Vigo! The No. 11 was just as horrendous, even against a weaker opponent than PSG. Asensio was anonymous, invisible, or any synonym of your choosing. He did nothing. Rodrygo? He helped Real pull out a victory, winning a penalty immediately upon joining the pitch.
Asensio may have the goals, but only fools who have no business talking about football solely look at goals. Unless a player is scoring 30+ goals in a season, they have to offer something besides scoring in order to be considered an effective player at a club like Real Madrid. Asensio is a right winger who does nothing besides score goals against defenses that are either incompetent or have given up. He is a very, very limited player.
Chelsea's defense is anything but incompetent. Thomas Tuchel is one of the best coaches on the planet, and after defeating Guardiola head-to-head in a Champions League Final, I think he has a case for being the most tactically adept. He transformed the Blues into a fearsome team in less than a season of work, and he knows how to maximize the talents of his defenders.
So Asensio isn't going to luck into goals against him. If anything, he is going to be exploited and embarrassed to an entirely new degree. If you thought his 0 out of 10 performance against PSG in the second leg was bad, wait until you see what Chelsea's physical, disciplined team can do to this miscast winger.
Real Madrid cannot make the mistake of starting him in another Champions League match. For all of his mistakes this season, Carlo must learn from this one. If not, Real can kiss another Champions League trophy goodbye.