In-network EOB shows discount of 100%?

My psychiatrist charged me $55 before my annual appointment (once yearly medication maintenance appointment, no new issues or medication changes in years). My plan has no copays but a lot of my doctors will charge a random/predicted amount ahead of time and reimburse later if insurance covers anything. I’ve had the same employer sponsored plan for years and the coverage is somehow wildly different each year… whoopie!

My EOB for the psychiatrist appointment shows “provider charges” of $145 and “plan discount” of $145. “Plan paid” is $0 and “patient responsibility” is $0. Does that mean my provider got paid at all? Is this an error?