Objects are not valid as a React child – package import fails

🐛 bug report

Preflight Checklist

• I have read the [Contributing Guidelines][contributing] for this project.
• I agree to follow the [Code of Conduct][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

I author a NPM package / library and use your fantastic server here and there.
But suddenly I get this message, as soon as the module gets imported:

Objects are not valid as a React child (found: object with keys {$$typeof, type, key, ref, props, _owner, _store}). If you meant to render a collection of children, use an array instead.

Yeah, I know what that message means.

This happens not from a component inside the library – it gets thrown by CSB 🤔

It only happens on CSB.

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

To be able to import the package without failure.

To Reproduce

Just visit the links above:

This version works. We get a blank page ✅
https://scdeh.csb.app/node_modules/@dnb/eufemia/@9.2.0

This version fails ❌
https://scdeh.csb.app/node_modules/@dnb/eufemia/@9.2.1

I can't find any error stack showing why this happens.

There is no difference in the versions that could evoke such an error. Here is the version diff:

https://github.com/dnbexperience/eufemia/compare/v9.2.0...v9.2.1?diff=split#diff-51e4f558fae534656963876761c95b83b6ef5da5103c4adef6768219ed76c2de

Open the two CodeSandbox reproduction URLs and compare the linked @dnb/eufemia v9.2.0...v9.2.1 diff first; the issue names no repository file or test. Trace why the newer package import produces the React child error, and consider the issue done when the package imports without that error in CodeSandbox.