Wrong type detection when using extend anchor in yaml files

[erfan-mehraban]

Describe the bug

In build command, If there is extend anchor in yaml file, fatal error accrues.

Files that can reproduce the issue

kustomization.yml

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

resources:
- deployment.yml

deployment.yml:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: deployment
spec:
  <<: &anchor
    key: value
  template:
    <<: *anchor

Expected output

successful build.

Actual output

$ kustomize build
Error: map[string]interface {}{"apiVersion":"apps/v1", "kind":"Deployment", "metadata":map[string]interface {}{"name":"deployment"}, "spec":map[interface {}]interface {}{"key":"value", "template":map[interface {}]interface {}{"key":"value"}}}: json: unsupported type: map[interface {}]interface {}

Kustomize version

{Version:kustomize/v4.4.0 GitCommit:63ec6bdb3d737a7c66901828c5743656c49b60e1 BuildDate:2021-09-27T16:24:12Z GoOs:linux GoArch:amd64}

Platform

Ubuntu 20.04.3 LTS

[k8s-ci-robot]

@erfan-mehraban: This issue is currently awaiting triage.

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[natasha41575]

@monopole Maybe another one you could take a look at?

[smurfralf]

Also a problem for us, coming from use of yaml merge in tekton 3pp: https://github.com/tektoncd/pipeline/blob/v0.22.0/config/300-clustertask.yaml#L47

[KnVerey]

/triage duplicate

Duplicate of #4215

/close

[k8s-ci-robot]

@KnVerey: Closing this issue.

In response to this:

/triage duplicate

Duplicate of #4215

/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.