Ratelimiter doesn't take sourceCriterion.requestHeaderName

Traefik Traefik v2
1

Here is my simple middleware config:

apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  name: ratelimit
spec:
  rateLimit:
    sourceCriterion:
      requestHeaderName: authorization
    average: 5
    burst: 1

But it looks like traefik doesn't take my connfig and keep using default IPStrategy
level=debug msg="Using IPStrategy" entryPointName=websecure routerName=contentv2-traefik-ingress-dev-dev-contentapi-traefik-dev-afe6c99ff5464f31beef-eastus-aksapp-io@kubernetes middlewareName=traefik-ratelimit@kubernetescrd middlewareType=RateLimiterType

How can I config the headerName?

Thanks