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.
reenterHydrationStateFromDehydratedSuspenseInstance,
  resetHydrationState,
  tryToClaimNextHydratableInstance,
  warnIfHydrating,
} from './ReactFiberHydrationContext.old';
import {
  adoptClassInstance,
  applyDerivedStateFromProps,
  constructClassInstance,
  mountClassInstance,
  resumeMountClassInstance,
  updateClassInstance,
} from './ReactFiberClassComponent.old';
import {resolveDefaultProps} from './ReactFiberLazyComponent.old';
import {
  resolveLazyComponentTag,
  createFiberFromTypeAndProps,
  createFiberFromFragment,
  createWorkInProgress,
  isSimpleFunctionComponent,
} from './ReactFiber.old';
import {
  markSpawnedWork,
  requestCurrentTimeForUpdate,
  retryDehydratedSuspenseBoundary,
  scheduleUpdateOnFiber,
  renderDidSuspendDelayIfPossible,
  markUnprocessedUpdateTime,
  getWorkInProgressRoot,
} from './ReactFiberWorkLoop.old';