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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

return this.props.children(this.state.text);
          }
        }
        const text1 = React.createRef(null);
        const text2 = React.createRef(null);
        function App() {
          return (
            <StrictMode>
              <Suspense
                maxDuration={1000}
                fallback={<Text text="Loading..." />}>
                <ConcurrentMode>
                  <UpdatingText ref={text1} initialText="Async: 1">
                    {text => (
                      <Fragment>
                        <Text text="Before" />
                        <AsyncText text={text} />
                        <Text text="After" />
                      </Fragment>
                    )}
                  </UpdatingText>
                </ConcurrentMode>
              </Suspense>
              <ConcurrentMode>
                <UpdatingText ref={text2} initialText="Sync: 1">
                  {text => (
                    <Fragment>
                      <Text text="Before" />
                      <Text text={text} />
                      <Text text="After" />