Styling is not visible caused by the Sandbox environment

[MitchelSt]

🐛 bug report

Preflight Checklist

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

Description of the problem

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

To Reproduce

1. Add an item by adding one to the form
2. Click on the item
3. => BUG: strike-through expected
4. Paste the exact same code in https://playcode.io/react
5. => Works: strike-through is visible

So the error is on caused by the Codesandbox environment

Link to sandbox: https://t.ly/HhcCB

Your Environment

Software	Name/Version
Сodesandbox	Mar 31, 2024
Browser	Chrome 123
Operating System	macOS (Sonoma)