export Zip is not identical

🐛 bug report

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project
  adheres to.
• I have searched the issue tracker for an issue that matches the one I want
  to file, without success.

Description of the problem

When exporting Zip from Code sandbox, the extracted folder is not identical to the codesandbox

codesandbox structure :

.
 ├── App.js
 ├── App.scss
 ├── index.js
 ├── package.json
 └── public
     └── index.html

exported Zip structure :

.
├── package.json
├── public
│   ├── favicon.ico
│   ├── index.html
│   └── manifest.json
├── README.md
└── src
    ├── App.js
    ├── App.scss
    ├── createServiceWorker.js
    ├── index.js
    ├── package.json
    └── public
        └── index.html

How has this issue affected you? What are you trying to accomplish?

I would like to reproduce my codesandbox instance locally.

To Reproduce

on the menu, go to File > export to Zip

Link to sandbox: link

Your Environment

Reproduce the problem from File > export to Zip using the linked sandbox, then compare the extracted tree with the listed CodeSandbox structure, including App.js, App.scss, index.js, package.json, and public/index.html. Trace the export entry point from that menu and verify that the resulting archive preserves the sandbox files and layout without the extra wrapper files shown in the report.