I hate to state the obvious and dig up the summer theme but it all goes wrong with the full backs. They simply cannot beat a player nor can they make a clean pass forwards. They’ve no talent creatively or skillfully. And so it’s really easy for the opponent to sit off them and wait for the mistake.
The other option , which they take up voluminously , is to just pass it back to the center backs, allowing the opponent to reset their structure, or pump it hopefully down the wing and hope that the winger, with back to goal , wins a 50/50, turns, beats the full back etc. it’s painful viewing