virtualservice timeout will not be deleted

[13567436138]

Describe the bug

A clear and concise description of what the bug is. Please provide the Canary definition and Flagger logs.

To Reproduce

change config form

apiVersion: flagger.app/v1beta1
kind: Canary
metadata:
  name: bookinfo
spec:
  revertOnDeletion: true
  targetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: reviews-v1
  provider: istio
  service:
    port: 9080
    name: reviews
    timeout: 1s
    gateways:
    - istio/bookinfo-gateway
    hosts:
    - "*"
  analysis:
    interval: 1m
    threshold: 10
    maxWeight: 50
    stepWeight: 20
    metrics:
      - name: request-success-rate
        thresholdRange:
          min: 99
        interval: 1m
      - name: request-duration
        thresholdRange:
          max: 500
        interval: 1m

to

apiVersion: flagger.app/v1beta1
kind: Canary
metadata:
  name: bookinfo
spec:
  revertOnDeletion: true
  targetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: reviews-v1
  provider: istio
  service:
    port: 9080
    name: reviews
    delegation: true
    gateways:
    - istio/bookinfo-gateway
    hosts:
    - "*"
  analysis:
    interval: 1m
    threshold: 10
    maxWeight: 50
    stepWeight: 20
    metrics:
      - name: request-success-rate
        thresholdRange:
          min: 99
        interval: 1m
      - name: request-duration
        thresholdRange:
          max: 500
        interval: 1m

spec:
  gateways:
  - istio/bookinfo-gateway
  hosts:
  - '*'
  http:
  - route:
    - destination:
        host: reviews-primary
      weight: 100
    - destination:
        host: reviews-canary
      weight: 0
    timeout: 1s

timeout: 1s did not deleted

Expected behavior

A clear and concise description of what you expected to happen.

Additional context

• Flagger version:
• Kubernetes version:
• Service Mesh provider:
• Ingress provider: