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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

enableProfilerTimer,
  enableUserTimingAPI,
  replayFailedUnitOfWorkWithInvokeGuardedCallback,
  warnAboutDeprecatedLifecycles,
} from 'shared/ReactFeatureFlags';
import getComponentName from 'shared/getComponentName';
import invariant from 'shared/invariant';
import warningWithoutStack from 'shared/warningWithoutStack';
import ReactFiberInstrumentation from './ReactFiberInstrumentation';
import * as ReactCurrentFiber from './ReactCurrentFiber';
import {
  now,
  scheduleDeferredCallback,
  cancelDeferredCallback,
  shouldYield,
  prepareForCommit,
  resetAfterCommit,
  scheduleTimeout,
  cancelTimeout,
  noTimeout,
} from './ReactFiberHostConfig';
import {
  markPendingPriorityLevel,
  markCommittedPriorityLevels,
  markSuspendedPriorityLevel,
  markPingedPriorityLevel,
  hasLowerPriorityWork,
  isPriorityLevelSuspended,
  findEarliestOutstandingPriorityLevel,
  didExpireAtExpirationTime,