Why did referee overturn Cucurella penalty on VAR review?

Marc Cucurella won a penalty for Chelsea in the 16th minute of the Brighton game after Facundo Buonanotte lunged into a tackle inside the box.

The referee initially awarded Chelsea a penalty but then overturned the call after a VAR review.

The slow-motion review showed that Buonanotte made contact with the ball first before catching Cucurella's leg.

Bizarrelly, the referee didn't give Chelsea a corner despite the fact that the ball crossed the line after Buonaotte's touch.