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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 prevProps = current.memoizedProps;
          const prevState = current.memoizedState;
          startPhaseTimer(finishedWork, 'componentDidUpdate');
          instance.props = finishedWork.memoizedProps;
          instance.state = finishedWork.memoizedState;
          instance.componentDidUpdate(
            prevProps,
            prevState,
            instance.__reactInternalSnapshotBeforeUpdate,
          );
          stopPhaseTimer();
        }
      }
      const updateQueue = finishedWork.updateQueue;
      if (updateQueue !== null) {
        instance.props = finishedWork.memoizedProps;
        instance.state = finishedWork.memoizedState;
        commitUpdateQueue(
          finishedWork,
          updateQueue,
          instance,
          committedExpirationTime,
        );
      }
      return;
    }
    case HostRoot: {
      const updateQueue = finishedWork.updateQueue;
      if (updateQueue !== null) {
        let instance = null;