There were series of wrong decisions made in that play. Bastoni running to cover for Acerbi, leaving his guy alone. Acerbi AND Pavard reacts to that, both running to cover Bastoni's flank. Then Bastoni realizes Pavard's flank is free so he attemps to cover that (as Zirkzee is back towards our goal at that point). So at that point it's a free shot from the edge of the box. But what is Sommer doing? Did Pavard's block attempt deceived him this much? He didn't try to make the attempt, meaning it was way too late when he saw the ball or he was already doing some prediction in his head and it went the other way, so he was way too late again?
There's still something to be rehearsed with that back trio, you can't triple one guy and then scramble from there, it's gonna be a mess after that as the attacker didn't even do some fancy shit, apart from that first fake shot/pass attempt.