File Export and Fork Bork'd

🐛 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

Cannot Export File to Zip

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

download source

To Reproduce

with the following sandbox
https://codesandbox.io/s/2cemck?file=/src/App.js:0-3846

reports CORS issue for fetching the png and then nothing is zipped or downloaded

Can't fork to github either, maybe same issue

Another example - these are from the DREI sample sight, which sadly many of the samples appear broken because of codesandbox

https://codesandbox.io/s/39hg8

Link to sandbox: link (optional)

Your Environment

No source file or test is identified. Reproduce the export-to-ZIP and GitHub fork flows using the linked CodeSandbox examples in Chrome or Firefox, then inspect the browser network and console output around the reported PNG CORS failure. Done means identifying the failing client flow and confirming that export and fork work for the affected sandboxes.