It’s easy to blame the goalkeeper when they get caught out by a crazy deflection, and it does look like Illan Meslier has tried too hard to anticipate this cross here.
There’s a wicked deflection that sends the ball shooting towards goal, but the keeper still has enough time to adjust and make sure this doesn’t go in:
Pictures from Canal+
It just looks like he can’t sort his feet or get down quickly enough, and it’s a proper sucker punch for Leeds after they managed to get themselves back into the game.