React version: 18.3.0-next-3ba7add60-20221201

Hard to reproduce.

In Next.js, in rare cases, and only after a fast refresh, the ref object when using forwardRef is simply `{}`.

This leads to the `TypeError: can't define property "current": Object is not extensible` error when used with `useImperativeHandle`.

```tsx
function Parent() {
  const carouselRef = useRef<any>();

  return <Suspense><Carousel ref={carouselRef} /></Suspense>
}

const Carousel = forwardRef((props, ref) => {
  if (!('current' in ref)) { debugger; }
  const thing = use(aPromise);
  return ...;
});
```

![Screenshot 2023-03-17 at 18 49 21](https://user-images.githubusercontent.com/5406212/225981809-22f575fa-0ec7-4f94-ae23-bffc8bf7c4dd.png)

In `updateImperativeHandle`, the ref is already an empty object.

![Screenshot 2023-03-17 at 19 13 13](https://user-images.githubusercontent.com/5406212/225985622-b8512a61-3a6b-4958-b63f-277219d4c816.png)

I haven't investigated it further yet, the stacktraces are quite hard to follow.
}
function warnIfSuspenseResolutionNotWrappedWithActDEV(root: FiberRoot): void {
  if (__DEV__) {
    if (
      root.tag !== LegacyRoot &&
      isConcurrentActEnvironment() &&
      ReactCurrentActQueue.current === null
    ) {
      console.error(
        'A suspended resource finished loading inside a test, but the event ' +
          'was not wrapped in act(...).\n\n' +
          'When testing, code that resolves suspended data should be wrapped ' +
          'into act(...):\n\n' +
          'act(() => {\n' +
          '  * finish loading suspended data *\n' +
          '});\n' +
          '* assert on the output *\n\n' +
          "This ensures that you're testing the behavior the user would see " +
          'in the browser.' +
          ' Learn more at https:reactjs.orglinkwrap-tests-with-act',
      );
    }
  }
}
export function setIsRunningInsertionEffect(isRunning: boolean): void {
  if (__DEV__) {
    isRunningInsertionEffect = isRunning;
  }
}