FAIL: TestE2E/WeightedRoute

```
--- FAIL: TestE2E/WeightedRoute (0.76s)
        --- PASS: TestE2E/WeightedRoute/SameWeight (0.22s)
        --- PASS: TestE2E/WeightedRoute/BlueGreen (0.15s)
        --- PASS: TestE2E/WeightedRoute/CompleteRollout (0.11s)
        --- FAIL: TestE2E/WeightedRoute/MixedValidAndInvalid (0.10s)
```

https://github.com/envoyproxy/gateway/actions/runs/19357855098/job/55391844616

cc @zhaohuabing 