As reported in https://github.com/vercel/next.js/issues/56919 it is possible for the ReadableStream controller to be written to after it is already closed. This is because inside an async context a Float method such as `ReactDOM.preload()` can attempt to flush newly created Resources even after the stream has completed.

React version: 

The underlying bug has been in React since Float landed. The expression of the Bug as reported in the Next.js repo was landed in: https://github.com/facebook/react/commit/701ac2e57290f913502c6012c15e815f412f84b7
The first Canary release to have this new expression was: [18.3.0-canary-f81c0f1ed-20230927](https://www.npmjs.com/package/react-dom/v/18.3.0-canary-f81c0f1ed-20230927)


## Steps To Reproduce

1. use `react-dom/server.edge`
2. Ensure the environment supports AsyncLocalStorage
3. Call Float method like `ReactDOM.preload(...)` after an await after the stream has closed

## The current behavior
If the conditions are right the Float call will initiate a write after the stream has closed and there will be a thrown exception

## The expected behavior
The Float call is ignored after the stream has closed. There are no errors
const node = children[i];
    task.treeContext = pushTreeContext(prevTreeContext, totalChildren, i);
    
    
    renderNode(request, task, node, i);
  }
  
  
  task.treeContext = prevTreeContext;
  task.keyPath = prevKeyPath;
}
function trackPostpone(
  request: Request,
  trackedPostpones: PostponedHoles,
  task: Task,
  segment: Segment,
): void {
  segment.status = POSTPONED;
  const keyPath = task.keyPath;
  const boundary = task.blockedBoundary;
  if (boundary !== null && boundary.status === PENDING) {
    boundary.status = POSTPONED;
    
    
    boundary.rootSegmentID = request.nextSegmentId++;
    const boundaryKeyPath = boundary.trackedContentKeyPath;
    if (boundaryKeyPath === null) {
      throw new Error(
        'It should not be possible to postpone at the root. This is a bug in React.',
      );