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.
current,
  workInProgress,
  Component,
  nextProps: any,
  renderExpirationTime,
) {
  if (__DEV__) {
    if (workInProgress.type !== workInProgress.elementType) {
      
      
      const innerPropTypes = Component.propTypes;
      if (innerPropTypes) {
        checkPropTypes(
          innerPropTypes,
          nextProps, 
          'prop',
          getComponentName(Component),
        );
      }
    }
  }
  let context;
  if (!disableLegacyContext) {
    const unmaskedContext = getUnmaskedContext(workInProgress, Component, true);
    context = getMaskedContext(workInProgress, unmaskedContext);
  }
  let nextChildren;