BackendRef weights not work

[czczycz]

I am testing the HttpRoute. I config BackendRefs with different weights(backend0 weight = 99 and backend1 weight = 1).

I sent thousands of requests and found that backend0 and backend1 received roughly the same number of requests.

I obtained the cluster configuration by admin API (/clusters?format=json). The clusters configuration shows that backend0 and backend1 have the same weight=1.

This is my httpRoute:

apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: myroute
  namespace: default
spec:
  hostnames:
  - example.com
  parentRefs:
  - group: gateway.networking.k8s.io
    kind: Gateway
    name: gw1
    namespace: default
    sectionName: http-80
  rules:
  - backendRefs:
    - group: gateway.envoyproxy.io
      kind: Backend
      name: backend0
      namespace:default
      port: 80
      weight: 99
    - group: gateway.envoyproxy.io
      kind: Backend
      name: backend1
      namespace: default
      port: 80
      weight: 1
    matches:
    - path:
        type: PathPrefix
        value: /

This is my clusters config:

"host_statuses": [
        {
            "address": {
                "socket_address": {
                    "address": "10.234.125.2",
                    "port_value": 80
                }
            },
            "stats": [],
            "health_status": {
                "eds_health_status": "HEALTHY"
            },
            "weight": 1,
            "locality": {
                "region": "httproute/default/myroute/rule/0/backend/0"
            }
        },
        {
            "address": {
                "socket_address": {
                    "address": "10.234.125.3",
                    "port_value": 80
                }
            },
            "stats": [],
            "health_status": {
                "eds_health_status": "HEALTHY"
            },
            "weight": 1,
            "locality": {
                "region": "httproute/default/myroute/rule/0/backend/1"
            }
        }
    ]

[czczycz]

It seems locality.LoadBalancingWeight doesn't work here