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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

Placement,
  ContentReset,
  DidCapture,
  Update,
  Ref,
} from 'shared/ReactSideEffectTags';
import ReactSharedInternals from 'shared/ReactSharedInternals';
import {
  debugRenderPhaseSideEffects,
  debugRenderPhaseSideEffectsForStrictMode,
  enableProfilerTimer,
} from 'shared/ReactFeatureFlags';
import invariant from 'shared/invariant';
import shallowEqual from 'shared/shallowEqual';
import getComponentName from 'shared/getComponentName';
import ReactStrictModeWarnings from './ReactStrictModeWarnings';
import warning from 'shared/warning';
import warningWithoutStack from 'shared/warningWithoutStack';
import * as ReactCurrentFiber from './ReactCurrentFiber';
import {startWorkTimer, cancelWorkTimer} from './ReactDebugFiberPerf';
import {
  mountChildFibers,
  reconcileChildFibers,
  cloneChildFibers,
} from './ReactChildFiber';
import {processUpdateQueue} from './ReactUpdateQueue';
import {NoWork, Never} from './ReactFiberExpirationTime';
import {ConcurrentMode, StrictMode} from './ReactTypeOfMode';
import {
  shouldSetTextContent,