istio: Web-sockets upgrade not working in alphav3

Describe the bug Prefix matching rules to upgrade the connection to web sockets are applied(kubctl apply) . When a request is made to WebSocket URL 404 occurs . It was observed that the rules are not seen in the envoy routes(istioctl proxy-config routes).

Expected behavior For URI’s filtered Web sockets must be working.

Steps to reproduce the bug apply the Virtual Service rules and you see envoy routes not being updated.

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: fashtagbackend-virtual-service
  namespace: fashtagbackend
spec:
  gateways:
  - fashtagbackend-gateway
  hosts:
  - 'fashtagbackend.fashtag.info'
  - fashtagbackend-service.backend.svc.cluster.local
  http:
  - match:
    - uri:
        prefix: "/replenishment/"
    route:
    - destination:
        host: fashtagbackend-service
      weight: 100
    websocketUpgrade: true
  - match:
    - uri:
        prefix: "/inventoryCount/"
    route:
    - destination:
        host: fashtagbackend-service
      weight: 100
    websocketUpgrade: true
  - match:
    - uri:
        prefix: "/transfer"
    route:
    - destination:
        host: fashtagbackend-service
      weight: 100
    websocketUpgrade: true
  - match:
    - uri:
        prefix: "/api/"
    route:
    - destination:
        host: fashtagbackend-service
      weight: 100

Version kubectl version - Major:“1”, Minor:“13” istioctl version - 1.0.5 Installation Istio is installed using helm Environment AWS