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**Do you want to request a *feature* or report a *bug*?**
bug, I believe, unless I misunderstand how it works
**What is the current behavior?**
Given a `Suspense` inside `Suspense` case like
```
<Suspense fallback="Fallback 1">
  <LazyText1 text="First text" />
  <Suspense fallback="Fallback 2">
    <LazyText2 text="Second text!" />
  </Suspense>
</Suspense>
```

Promises in `LazyTexts` start resolving at the same time, but if `LazyText2` is resolved first it never renders, `Fallback 2` stays.

Result:
```
First text

Fallback 2
```

Please see https://codesandbox.io/s/234o4zry7n

**What is the expected behavior?**

Every `LazyText` displayed in the end
```
First text

Second text!
```

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
react, react-dom 16.6.0

const render = newProps.children;
  if (__DEV__) {
    warningWithoutStack(
      typeof render === 'function',
      'A context consumer was rendered with multiple children, or a child ' +
        "that isn't a function. A context consumer expects a single child " +
        'that is a function. If you did pass a function, make sure there ' +
        'is no trailing or leading whitespace around it.',
    );
  }
  prepareToReadContext(workInProgress, renderExpirationTime);
  const newValue = readContext(context, newProps.unstable_observedBits);
  let newChildren;
  if (__DEV__) {
    ReactCurrentOwner.current = workInProgress;
    ReactCurrentFiber.setCurrentPhase('render');
    newChildren = render(newValue);
    ReactCurrentFiber.setCurrentPhase(null);
  } else {
    newChildren = render(newValue);
  }
  
  workInProgress.effectTag |= PerformedWork;
  reconcileChildren(current, workInProgress, newChildren, renderExpirationTime);
  return workInProgress.child;
}
/*
  function reuseChildrenEffects(returnFiber : Fiber, firstChild : Fiber) {
    let child = firstChild;
    do {