When Chelsea pressed the goalkeeper, usually Nkunku, they had an even easier option because a simple third-man combination to Van Hecke was enough to ma him free to drive forward.
Despite Verbruggen's mistake, he was still the main difference between the two teams build up.

But they also played Hinshelwood with a third-man combination so he had a chance to drive forward in the middle.

They increased the distance between Dunk and Hinshelwood so much that Dunk had time to drive the ball 15 yards forward and give a good pass before Palmer caught up with him.

When Chelsea pressed high, it was Palmer who had to watch two men at once. He was on Hinshelwood initially but then had to jump to Dunk when he got the ball. Brighton had more than one good solutions.

Chelsea tried to go long to Neto against Lamptey 1 on 1 or combine between Cucu and Sancho. Chelsea doesn't have a striker who can keep the ball when they go long, but Sanchez goes long most of the times when pressed and Chelsea loses the ball easily.