list widget of code widget does not persist both fields "code" and "lang"

[slumbering]

Describe the bug

Where creating a List widget of Code widget and persist it, only one of them is actually saved (code or lang) but not both of them

To Reproduce

Create a config file with the following:

  - label: "Terminal"
    name: "terminal"
    widget: "list"
    field:
      {
        label: "Code Snippet",
        name: "code_snippet",
        widget: "code",
      }

Expected behavior

When published, both code and lang are saved within the markdown

Screenshots

Applicable Versions:

• Netlify CMS version: 2.10.186
• Git provider: Github (but with git-gateway locally)
• OS: MacOS Monterey
• Browser version Firefox 97.0.1

• Node.JS version: v15.14.0

CMS configuration

# Uncomment when in dev mod
local_backend: true
backend:
  name: git-gateway
media_folder: public/img
publish_mode: editorial_workflow
site_url: https://dagger.io
show_preview_links: true
public_folder: img
collections:
  - name: "pages"
    label: "Pages"
    files:
      - label: "Home"
        name: "Home"
        file: "content/home.md"
        fields:
          - label: "Section Hero"
            name: "hero"
            widget: "object"
            collapsed: true
            fields:
              - { label: "Title", name: "title", widget: "string" }
              - { label: "Content", name: "body", widget: "markdown" }
              - { label: "Call to action", name: "cta", widget: "string" }
              - { label: "Image", name: "img", widget: "image" }

          - label: "Parallax"
            name: "storyParallax"
            widget: "object"
            collapsed: true
            fields:
              - label: "Slide-1"
                name: "slide1"
                widget: "object"
                fields:
                  - { label: "Image", name: "img", widget: "image" }
                  - { label: "Title", name: "title", widget: "string" }
                  - { label: "Content", name: "body", widget: "markdown" }
              - label: "Slide-2"
                name: "slide2"
                widget: "object"
                fields:
                  - { label: "Image", name: "img", widget: "image" }
                  - { label: "Title", name: "title", widget: "string" }
                  - { label: "Content", name: "body", widget: "markdown" }
              - label: "Slide-3"
                name: "slide3"
                widget: "object"
                fields:
                  - { label: "Image", name: "img", widget: "image" }
                  - { label: "Title", name: "title", widget: "string" }
                  - { label: "Content", name: "body", widget: "markdown" }
              - label: "Slide-4"
                name: "slide4"
                widget: "object"
                fields:
                  - { label: "Image", name: "img", widget: "image" }
                  - { label: "Title", name: "title", widget: "string" }
                  - { label: "Content", name: "body", widget: "markdown" }

          - label: "How it works"
            name: "howItWorks"
            widget: "object"
            fields:
              - { label: "Title", name: "title", widget: "string" }
              - label: "Content"
                name: "content"
                widget: "list"
                summary: "{{fields.title}}"
                fields:
                  - { label: "Title", name: "title", widget: "string" }
                  - { label: "Content", name: "body", widget: "markdown" }
                  - { label: "Image", name: "img", widget: "image" }
              - label: "Terminal"
                name: "terminal"
                widget: "list"
                field:
                  {
                    label: "Code Snippet",
                    name: "code_snippet",
                    widget: "code",
                  }
          - label: "Section Footer"
            name: "footer"
            widget: "object"
            collapsed: true
            fields:
              - { label: "Title", name: "title", widget: "string" }
              - { label: "Content", name: "body", widget: "markdown" }
              - { label: "Call to action", name: "cta", widget: "string" }
              - { label: "Image", name: "img", widget: "image" }
      - label: "Terms of Service"
        name: "terms-of-service"
        file: "content/terms-of-service.md"
        fields:
          - { label: "Title", name: "title", widget: "string" }
          - {
              label: "Publish Date",
              name: "date",
              widget: "datetime",
              date_format: "MMMM YYYY",
              time_format: false,
            }
          - { label: "Body", name: "body", widget: "markdown" }
      - label: "Privacy policy"
        name: "privacy-policy"
        file: "content/privacy-policy.md"
        fields:
          - { label: "Title", name: "title", widget: "string" }
          - {
              label: "Publish Date",
              name: "date",
              widget: "datetime",
              date_format: "MMMM YYYY",
              time_format: false,
            }
          - { label: "Body", name: "body", widget: "markdown" }
  - name: "blog"
    label: "Blog"
    folder: "content/blog/posts"
    create: true
    slug: "{{slug}}"
    identifier_field: slug
    fields:
      - { label: "Slug", name: "slug", widget: "string" }
      - { label: "Title", name: "title", widget: "string" }
      - { label: "Publish Date", name: "date", widget: "datetime" }
      - { label: "Featured Image", name: "thumbnail", widget: "image" }
      - { label: "Body", name: "body", widget: "markdown" }

Additional context