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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

expect(mountCall[5]).toBe(28); 
        expect(updateCall[1]).toBe('update');
        expect(updateCall[2]).toBe(4); 
        expect(updateCall[3]).toBe(17); 
        expect(updateCall[4]).toBe(58); 
        expect(updateCall[5]).toBe(62); 
      });
      it('includes time spent in render phase lifecycles', () => {
        class WithLifecycles extends React.Component {
          state = {};
          static getDerivedStateFromProps() {
            advanceTimeBy(3);
            return null;
          }
          shouldComponentUpdate() {
            advanceTimeBy(7);
            return true;
          }
          render() {
            advanceTimeBy(5);
            return null;
          }
        }
        const callback = jest.fn();
        advanceTimeBy(5); 
        const renderer = ReactTestRenderer.create(
          <React.unstable_Profiler id="test" onRender={callback}>
            <WithLifecycles />
          </React.unstable_Profiler>,
        );