Repro case with a master build: https://codesandbox.io/s/stoic-mcnulty-dhygf?file=/src/App.js:668-703

Expected: we see content after a second.
Actual: fallback never resolves.

This happens in a sequence of:

1. Normal update
   - which suspends
2. Idle update
   - which also suspends
3. An unrelated normal update immediately followed by a ping (so they're batched)
   - here, we decide to stay on fallback, but should've shown the content

If you remove `_setVersion(v => v + 1);` on line 44 then the issue goes away.
/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow
 */
import type {ReactProviderType, ReactContext} from 'shared/ReactTypes';
import type {BlockComponent} from 'react/src/ReactBlock';
import type {LazyComponent as LazyComponentType} from 'react/src/ReactLazy';
import type {Fiber} from './ReactInternalTypes';
import type {FiberRoot} from './ReactInternalTypes';
import type {ExpirationTime} from './ReactFiberExpirationTime.new';
import type {
  SuspenseState,
  SuspenseListRenderState,
  SuspenseListTailMode,
} from './ReactFiberSuspenseComponent.new';
import type {SuspenseContext} from './ReactFiberSuspenseContext.new';
import checkPropTypes from 'shared/checkPropTypes';
import {
  IndeterminateComponent,
  FunctionComponent,
  ClassComponent,
  HostRoot,
  HostComponent,
  HostText,