Cross-provider context error on k8s

Traefik Traefik v2 (latest)
1

There will be a warning msg said namespace "MY_NAMESPACE" is ignored in cross-provider context" providerName=kubernetescrd serviceName=api@internal if I created the IngressRoute:

apiVersion: traefik.containo.us/v1alpha1
kind: IngressRoute
metadata:
  name: traefik-ashboard
  namespace: MY_NAMESPACE
spec:
  entryPoints:
    - http
    - https
  routes:
  - match: Host(`traefik-dashboard-MY_DOMAIN`)
    kind: Rule
    middlewares:
    - name: http-auth
    priority: 50
    services:
    - name: api@internal
      kind: TraefikService

And I got an error 404 page while accessing the domain.

Env:
Kubernetes: 1.16.2
Traefik: 2.1.1
Ingress: k8s ingress for all the host and traefik IngressRoute for global-http-redirect-to-https and traefik-dashboard.
TLS: true
Args:

          volumeMounts:
          - mountPath: "/config"
            name: "config"
          - mountPath: "/crts"
            name: "tls-certs"
          args:
            - --api
            - --log.level=INFO
            - --accesslog
            - --entrypoints.http.Address=:80
            - --entrypoints.https.Address=:443
            - --providers.kubernetesingress
            - --providers.kubernetescrd
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