[Bug]: "Clear" / "Reload" button in CodeSandbox does not reset user edits to original sample code

Summary

Component: Interactive Code Sandbox

Steps to Reproduce:

1. Navigate to the "Treat state as read-only" section in the React documentation.
2. Modify the sample code inside the sandbox. Change:

position.x = e.clientX;
position.y = e.clientY;

to:

const p = { x: e.clientX, y: e.clientY };
setPosition(p);

3.Observe that the red dot starts following the cursor as expected.
4.Click the "Clear" or "Reload" button on the sandbox to undo the edits and restore the original code sample.

Expected Result:
The sandbox should revert to the original, unedited sample code (position.x = e.clientX), and the red dot should stop following the cursor.

Actual Result:
The red dot continues to follow the cursor despite triggering a reset.

Page

https://react.dev/learn/updating-objects-in-state

Details

首先在 react.dev/learn/updating-objects-in-state 的 "Treat state as read-only" 部分复现重置行为，然后跟踪 Interactive Code Sandbox 的重置流程。当 Clear 或 Reload 恢复原始示例代码，并且红点不再跟随光标时，即表示完成。