CodeSandbox dependency manager not showing true latest versions for `@mui` packages

🐛 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 searching for @mui/material in the dependency manager, only the release candidate versions appear:

However, in the npm registry, the latest published version is 5.0.1.

Though when you hardcode 5.0.1 or latest in package.json, the actual version will be resolved but it is not searchable.

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

The true latest stable versions (5.0.0 and 5.0.1) should be visible so users creating sandbox repos will use the correct ones.

To Reproduce

Link to sandbox: link

Your Environment

Reproduce the search for @mui/material in the dependency manager and compare its results with the npm registry, using the linked sandbox as context. Inspect the package.json dependency resolution behavior; done means stable versions 5.0.0 and 5.0.1 are searchable while existing hardcoded and latest resolution still works.