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.
if (__DEV__) {
        if (workInProgress.type !== workInProgress.elementType) {
          const outerPropTypes = Component.propTypes;
          if (outerPropTypes) {
            checkPropTypes(
              outerPropTypes,
              resolvedProps, 
              'prop',
              getComponentName(Component),
            );
          }
        }
      }
      child = updateMemoComponent(
        null,
        workInProgress,
        Component,
        resolveDefaultProps(Component.type, resolvedProps), 
        updateExpirationTime,
        renderExpirationTime,
      );
      return child;
    }
    case Block: {
      if (enableBlocksAPI) {
        
        child = updateBlock(
          null,
          workInProgress,
          Component,