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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

fiber,
            errorInfo,
            expirationTime,
          );
          enqueueUpdate(fiber, update);
          scheduleWork(fiber, expirationTime);
          return;
        }
        break;
      case HostRoot: {
        const errorInfo = createCapturedValue(value, sourceFiber);
        const update = createRootErrorUpdate(fiber, errorInfo, expirationTime);
        enqueueUpdate(fiber, update);
        scheduleWork(fiber, expirationTime);
        return;
      }
    }
    fiber = fiber.return;
  }
  if (sourceFiber.tag === HostRoot) {
    // 
    // 
    const rootFiber = sourceFiber;
    const errorInfo = createCapturedValue(value, rootFiber);
    const update = createRootErrorUpdate(rootFiber, errorInfo, expirationTime);
    enqueueUpdate(rootFiber, update);
    scheduleWork(rootFiber, expirationTime);
  }
}
function computeThreadID(