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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(500);
        const highPriUpdateInteraction = {
          id: 1,
          name: 'hiPriUpdate',
          timestamp: mockNow(),
        };
        const originalPromise = resourcePromise;
        renderer.unstable_flushSync(() => {
          SchedulerTracing.unstable_trace(
            highPriUpdateInteraction.name,
            highPriUpdateInteraction.timestamp,
            () => {
              renderer.update(
                <React.unstable_Profiler id="app" onRender={onRender}>
                  <React.Suspense
                    maxDuration={2000}
                    fallback={<Text text="loading" />}>
                    <AsyncText text="loaded" ms={1000} />
                  </React.Suspense>
                  <Text text="updated" />
                </React.unstable_Profiler>,
              );
            },
          );
        });
        expect(ReactTestRenderer).toHaveYielded([
          'Suspend [loaded]',
          'Text [loading]',
          'Text [updated]',
        ]);