[BUG] modifications in generated resource are not overridden till the next sync

[JimBugwadia]

Software version numbers

1.3.0-rc9

Describe the bug

Generate a resource with synchronize: true. Now change the resource. The expectation is that the changes are immediately reverted to match the policy clone source resource or data element.

To Reproduce

Apply policy:

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: generate-secret
spec:
  rules:
  - name: generate-secret
    match:
      resources:
        kinds:
        - Namespace
    generate:
      synchronize: true
      kind: Secret
      name: mysecret
      namespace: "{{ request.object.metadata.name }}"
      data:
        kind: Secret
        type: Opaque
        data:
          secret1: c2VjcmV0
          secret2: c2VjcmV0
          secret3: c2VjcmV0          

Then edit the resource. Remove secret2 and add a secret4.

Expected behavior

The resource changes are reverted to match the policy.

Note that changes to other data elements (not controlled by the policy) should not be updated.