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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

} else {
            ReactNoop.yield(`Promise resolved [${text}]`);
            resolve(text);
          }
        }, ms),
      );
    }, ([text, ms]) => text);
    textResourceShouldFail = false;
  });
  
  
  
  
  
  
  function span(prop) {
    return {type: 'span', children: [], prop, hidden: false};
  }
  function advanceTimers(ms) {
    
    
    if (typeof ms !== 'number') {
      throw new Error('Must specify ms');
    }
    jest.advanceTimersByTime(ms);
    
    
    return Promise.resolve().then(() => {});
  }
  function Text(props) {