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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

rootWithPendingPassiveEffects = null;
  passiveEffectCallbackHandle = null;
  passiveEffectCallback = null;
  
  const previousIsRendering = isRendering;
  isRendering = true;
  let effect = firstEffect;
  do {
    if (effect.effectTag & Passive) {
      let didError = false;
      let error;
      if (__DEV__) {
        invokeGuardedCallback(null, commitPassiveHookEffects, null, effect);
        if (hasCaughtError()) {
          didError = true;
          error = clearCaughtError();
        }
      } else {
        try {
          commitPassiveHookEffects(effect);
        } catch (e) {
          didError = true;
          error = e;
        }
      }
      if (didError) {
        captureCommitPhaseError(effect, error);
      }
    }
    effect = effect.nextEffect;