I don't think there's a problem with Wan Bissaka at all. We forget how young he is, and I think that, with his physical attributes and improvements on the ball, in a couple of seasons he could be marching Shaw's current form. As you say. His defending has been back to last season's levels, and he often looks dangerous when attacking now we play better on the right.
I actually think Greenwood has got much better at supporting Wan Bissaka recently, but I still think AWB would really benefit from someone who is more suited to playing as a proper winger, like Sancho. It would mean we could potentially learn to build up play down the right how we currently do down the left. That would make switching the play much easier and more effective and make it so much harder to press our centre backs.