Does not work with Decap CMS 3.x.x

[pranaysahith]

Describe the bug
Does not work with Decap CMS 3.0.0
To Reproduce
see config.yml and index.html below
Expected behavior
Parent field loads

Applicable Versions:

• Decap CMS version: decap-cms@3.8.3
• Git provider: azure
• Browser version: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36

CMS configuration

backend:
  name: azure
publish_mode: simple
show_preview_links: false
media_folder: docs-site/static/.attachments/
public_folder: docs-site/static/.attachments
collections:
  - name: docs
    label: docs
    folder: docs-site
    create: true
    extension: md
    editor:
      visualEditing: true
    summary: "{{dirname}}/{{filename}}.{{extension}}"
    fields:
      - name: path
        meta: true
        required: true
        label: Parent
        widget: parent
        index_file: index
      - label: Title
        name: title
        widget: string
        required: false
      - label: Body
        name: body
        widget: markdown
        required: false
      - label: Tags
        name: tags
        widget: list
        required: false
    nested:
      depth: 10
      subfolders: false
      summary: "{{slug}}"
    meta:
      path:
        label: Parent
        widget: parent
        index_file: index
    publish: true
    type: folder_based_collection
    sortable_fields:
      - commit_date
      - title
      - commit_author
    view_filters: []
    view_groups: []
slug:
  encoding: unicode
  clean_accents: false
  sanitize_replacement: "-"
isFetching: false
error: null

Additional context

<script src="https://unpkg.com/decap-cms@^3.0.0/dist/decap-cms.js"></script>
  <script src="https://unpkg.com/@netlify/netlify-cms-widget-parent@^1.0.12/dist/netlify-cms-widget-parent.js"></script>
  <script>
    const parentWidget = window.NetlifyCmsWidgetParent;
    CMS.registerWidget('parent', parentWidget.control, parentWidget.preview);
  </script>