Apply filter to allow duplicate headers in Istio with Sidecar

I have a basic Kubernetes setup with Istio/Sidecar to encrypt the communication with mtls. I found out that by default I cannot send network requests between the pods with duplicated headers. Duplicated header keys are filtered/deleted. I tried to apply this configuration in order to disable this functionality:

apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: auth-header-filter
spec:
  workloadSelector:
    labels:
      app: received_pod_name
  configPatches:
  - applyTo: HTTP_FILTER
    match:
      context: SIDECAR_INBOUND
      listener:
        filterChain:
          filter:
            name: "envoy.filters.network.http_connection_manager"
    patch:
      operation: MERGE
      value:
        name: "envoy.filters.network.http_connection_manager"
        typed_config:
          "@type": "type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager"
          http_protocol_options:
            allow_duplicate_authorization_header: true

But again the second request header is removed. Any idea how to fix this?

I don't think allow_duplicate_authorization_header is a valid field in the code. This is not going to work.