IP Check policy doesn't strip the port

{
  "name": "headers",
  "version": "builtin",
  "configuration": {
    "request": [
      {
        "value_type": "liquid",
        "op": "set",
        "header": "X-Forwarded-For",
        "value": "{{ headers['x-forwarded-for'] | first | split: ':' | first}}"
      }
    ]
  }
}

curl -vk -H "X-Forwarded-For: 1.2.3.4:1234" "http://localhost:8080/employee?app_id=7bb9f339&app_key=f11473a24de209afac139c856a3f7a0a"

{
  "services": [
    {
      "id": 2,
      "account_id": 2,
      "name": "Echo Api",
      "oneline_description": null,
      "description": "This is the echo API",
      "txt_api": null,
      "txt_support": null,
      "txt_features": null,
      "created_at": "2018-12-12T15:42:05+01:00",
      "updated_at": "2020-05-22T11:38:30+02:00",
      "logo_file_name": null,
      "logo_content_type": null,
      "logo_file_size": null,
      "state": "incomplete",
      "intentions_required": false,
      "draft_name": "",
      "infobar": null,
      "terms": null,
      "display_provider_keys": false,
      "tech_support_email": null,
      "admin_support_email": null,
      "credit_card_support_email": null,
      "buyers_manage_apps": true,
      "buyers_manage_keys": true,
      "custom_keys_enabled": true,
      "buyer_plan_change_permission": "request",
      "buyer_can_select_plan": false,
      "notification_settings": {
        "web_provider": [
          0,
          100
        ],
        "email_provider": [
          0,
          100
        ],
        "web_buyer": [
          0,
          100
        ],
        "email_buyer": [
          0,
          100
        ]
      },
      "default_application_plan_id": 2,
      "default_service_plan_id": 2,
      "tenant_id": 2,
      "system_name": "echo2",
      "backend_version": "2",
      "mandatory_app_key": true,
      "buyer_key_regenerate_enabled": true,
      "support_email": "admin@example.com",
      "referrer_filters_required": false,
      "deployment_option": "self_managed",
      "kubernetes_service_link": null,
      "act_as_product": false,
      "proxiable?": true,
      "backend_authentication_type": "service_token",
      "backend_authentication_value": "1234567879",
      "proxy": {
        "service_id": 2,
        "authentication_method": "2",
        "id": 109330,
        "lock_version": 105,
        "tenant_id": 2,
        "endpoint": "http://prod.echo.127.0.0.1.xip.io:8080",
        "deployed_at": null,
        "api_backend": "https://echo-api.3scale.net:443",
        "auth_app_key": "app_key",
        "auth_app_id": "app_id",
        "auth_user_key": "user_key",
        "credentials_location": "query",
        "error_auth_failed": "Authentication failed",
        "error_auth_missing": "Authentication parameters missing",
        "created_at": "2018-12-12T15:42:05+01:00",
        "updated_at": "2020-05-22T11:38:30+02:00",
        "error_status_auth_failed": 403,
        "error_headers_auth_failed": "text/plain; charset=us-ascii",
        "error_status_auth_missing": 403,
        "error_headers_auth_missing": "text/plain; charset=us-ascii",
        "error_no_match": "No Mapping Rule matched",
        "error_status_no_match": 404,
        "error_headers_no_match": "text/plain; charset=us-ascii",
        "secret_token": "Shared_secret_sent_from_proxy_to_API_backend",
        "hostname_rewrite": "",
        "oauth_login_url": null,
        "sandbox_endpoint": "http://stg.echo.127.0.0.1.xip.io:8080",
        "api_test_path": "/employee/",
        "api_test_success": null,
        "apicast_configuration_driven": true,
        "oidc_issuer_endpoint": null,
        "oidc_issuer_type": null,
        "error_headers_limits_exceeded": "text/plain; charset=us-ascii",
        "error_status_limits_exceeded": 429,
        "error_limits_exceeded": "Usage limit exceeded",
        "staging_domain": "stg.echo.127.0.0.1.xip.io",
        "production_domain": "prod.echo.127.0.0.1.xip.io",
        "hostname_rewrite_for_sandbox": "echo-api.3scale.net",
        "endpoint_port": 8080,
        "valid?": true,
        "service_backend_version": "2",
        "hosts": [
          "prod.echo.127.0.0.1.xip.io",
          "stg.echo.127.0.0.1.xip.io"
        ],
        "backend": {
          "endpoint": "https://su1.3scale.net",
          "host": "su1.3scale.net"
        },
        "policy_chain": [
                    {
            "name": "ip_check",
            "version": "builtin",
            "configuration": {
              "error_msg": "IP address not allowed",
              "client_ip_sources": [
                "X-Forwarded-For"
              ],
              "ips": [
                "1.2.3.4",
                "5.6.7.8"
              ],
              "check_type": "whitelist"
            }
          },
          {
            "name": "apicast",
            "version": "builtin",
            "configuration": {}
          }
        ],
        "jwt_claim_with_client_id": null,
        "jwt_claim_with_client_id_type": null,
        "proxy_rules": [
          {
            "id": 2,
            "proxy_id": 2,
            "http_method": "GET",
            "pattern": "/",
            "metric_id": 2,
            "metric_system_name": "hits",
            "delta": 1,
            "tenant_id": 2,
            "created_at": "2020-05-22T11:31:18+02:00",
            "updated_at": "2020-05-22T11:31:18+02:00",
            "redirect_url": null,
            "position": 4,
            "last": false,
            "owner_id": 2,
            "owner_type": "Proxy",
            "parameters": [],
            "querystring_parameters": {}
          }
        ]
      }
    }
  ]
}