Why don't we use Camavinga at LB anymore?

It seems like Camavinga apparently is not a starter anymore in the midfield. But we all know he definitely is our best LB, because I mean Mendy is a liability and Fran is just ok in my opinion.
Mendy seriously has zero creativity and no opinions of his own and keeps slipping and loosing the ball - I just see no reason to not use Camavinga there when he will be on the bench otherwise...