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.
) {
       Onl
      return;
    }
     We show the whole stack but dedupe on the top component's name because
     the problematic code almost always lies inside that component.
    const componentName = getComponentNameFromFiber(fiber) || 'ReactComponent';
    if (didWarnStateUpdateForNotYetMountedComponent !== null) {
      if (didWarnStateUpdateForNotYetMountedComponent.has(componentName)) {
        return;
      }
       $Fl
      didWarnStateUpdateForNotYetMountedComponent.add(componentName);
    } else {
      didWarnStateUpdateForNotYetMountedComponent = new Set([componentName]);
    }
    const previousFiber = ReactCurrentFiberCurrent;
    try {
      setCurrentDebugFiberInDEV(fiber);
      console.error(
        "Can't perform a React state update on a component that hasn't mounted yet. " +
          'This indicates that you have a side-effect in your render function that ' +
          'asynchronously later calls tries to update the component. Move this work to ' +
          'useEffect instead.',
      );
    } finally {
      if (previousFiber) {
        setCurrentDebugFiberInDEV(fiber);
      } else {
        resetCurrentDebugFiberInDEV();