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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

}
function finishRendering() {
  nestedUpdateCount = 0;
  lastCommittedRootDuringThisBatch = null;
  if (completedBatches !== null) {
    const batches = completedBatches;
    completedBatches = null;
    for (let i = 0; i < batches.length; i++) {
      const batch = batches[i];
      try {
        batch._onComplete();
      } catch (error) {
        if (!hasUnhandledError) {
          hasUnhandledError = true;
          unhandledError = error;
        }
      }
    }
  }
  if (hasUnhandledError) {
    const error = unhandledError;
    unhandledError = null;
    hasUnhandledError = false;
    throw error;
  }
}
function performWorkOnRoot(
  root: FiberRoot,
  expirationTime: ExpirationTime,
  isYieldy: boolean,