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.
debugRenderPhaseSideEffectsForStrictMode,
  disableLegacyContext,
  disableModulePatternComponents,
  enableProfilerTimer,
  enableSchedulerTracing,
  enableSuspenseServerRenderer,
  enableFundamentalAPI,
  warnAboutDefaultPropsOnFunctionComponents,
  enableScopeAPI,
  enableBlocksAPI,
} from 'shared/ReactFeatureFlags';
import invariant from 'shared/invariant';
import shallowEqual from 'shared/shallowEqual';
import getComponentName from 'shared/getComponentName';
import ReactStrictModeWarnings from './ReactStrictModeWarnings.new';
import {REACT_LAZY_TYPE, getIteratorFn} from 'shared/ReactSymbols';
import {
  getCurrentFiberOwnerNameInDevOrNull,
  setIsRendering,
} from './ReactCurrentFiber';
import {
  resolveFunctionForHotReloading,
  resolveForwardRefForHotReloading,
  resolveClassForHotReloading,
} from './ReactFiberHotReloading.new';
import {
  mountChildFibers,
  reconcileChildFibers,
  cloneChildFibers,
} from './ReactChildFiber.new';