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.
const primaryChildFragment = createFiberFromFragment(
               
               
              null,
              mode,
              NoWork,
              null,
            );
            primaryChildFragment.return = workInProgress;
             
             
            primaryChildFragment.child = null;
            if ((workInProgress.mode & BlockingMode) === NoMode) {
               
               
              let progressedChild = (primaryChildFragment.child =
                workInProgress.child);
              while (progressedChild !== null) {
                progressedChild.return = primaryChildFragment;
                progressedChild = progressedChild.sibling;
              }
            } else {
               
               
              reconcileChildFibers(
                workInProgress,
                current.child,
                null,
                renderExpirationTime,
              );