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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

jest.advanceTimersByTime(ms);
        
        
        return Promise.resolve().then(() => {});
      }
      it('traces both the temporary placeholder and the finished render for an interaction', async () => {
        loadModulesForTracing({useNoopRenderer: true});
        const interaction = {
          id: 0,
          name: 'initial render',
          timestamp: mockNow(),
        };
        const monkey = React.createRef();
        class Monkey extends React.Component {
          render() {
            ReactNoop.yield('Monkey');
            return null;
          }
        }
        const onRender = jest.fn();
        SchedulerTracing.unstable_trace(interaction.name, mockNow(), () => {
          ReactNoop.render(
            <React.unstable_Profiler id="test-profiler" onRender={onRender}>
              <React.Suspense fallback={<Text text="Loading..." />}>
                <AsyncText text="Async" ms={20000} />
              </React.Suspense>
              <Text text="Sync" />
              <Monkey ref={monkey} />
            </React.unstable_Profiler>,
          );