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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

listeners.forEach(listener => listener.reject(value));
                  } else {
                    ReactTestRenderer.unstable_yield(
                      `Promise resolved [${text}]`,
                    );
                    status = 'resolved';
                    value = text;
                    listeners.forEach(listener => listener.resolve(value));
                  }
                }, ms);
              } else {
                listeners.push({resolve, reject});
              }
              break;
            }
            case 'resolved': {
              resolve(value);
              break;
            }
            case 'rejected': {
              reject(value);
              break;
            }
          }
        },
      };
    }, ([text, ms]) => text);
    textResourceShouldFail = false;
  });
  function Text(props) {