Parameter substitution does not work correctly with nested matrix generators in the second child (only when goTemplate=true) about argo-cd HOT 4 OPEN

- clusters:
    selector:
      matchLabels:
        rarexixi/group: dip
    values:
      basename: '{{- `{{ index .metadata.labels "rarexixi/env" }}` -}}'

apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: appset-cm-test-matrix
spec:
  goTemplate: true
  goTemplateOptions: ["missingkey=error"]
  generators:
  - matrix:
      generators:
      - git:
          repoURL: https://gitee.com/rarexixi/argocd-appset-generator.git
          revision: HEAD
          directories:
          - path: config-map/*
          - path: "config-map/logs"
            exclude: true
          values:
            basename: '{{.path.basename}}'
      - clusters:
          selector:
            matchLabels:
              rarexixi/group: dip
          values:
            env: '{{index .metadata.labels "rarexixi/env"}}' # report an error
  template:
    metadata:
      name: 'cm-test-matrix-{{.values.basename}}-{{index .metadata.labels "rarexixi/env"}}' # work well 
      labels:
        appset-name: appset-cm-test-matrix
    spec:
      project: default
      source:
        repoURL: https://gitee.com/rarexixi/argocd-appset-generator.git
        targetRevision: HEAD
        path: "{{.path.path}}"
      destination:
        server: "{{.server}}"
        namespace: dip-system