He's in the wrong position. After 6 months people have worked it out. He cant use his left, just don't take him down in the box and he'll just crab sideways until he's off balance and shoots. He doesn't run to the back post, because he doesn't like finishing first time with his left either.
When he's in the middle of things he still puts in some nice pieces of play, like the pass which put Bernardo through on goal only to be wrongly flagged offside. And his pressing and movement, and general workload were great today so it's not fatigue.
He's just a right sided player who was capable of filling in on the left for a bit, but not 6 months.