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 progressedState: SuspenseState = workInProgress.memoizedState;
          const progressedPrimaryChild: Fiber | null =
            progressedState !== null
              ? (workInProgress.child: any).child
              : (workInProgress.child: any);
          primaryChildFragment.child = progressedPrimaryChild;
          let progressedChild = progressedPrimaryChild;
          while (progressedChild !== null) {
            progressedChild.return = primaryChildFragment;
            progressedChild = progressedChild.sibling;
          }
        }
         
         
        if (enableProfilerTimer && workInProgress.mode & ProfileMode) {
           
          let treeBaseDuration = 0;
          let hiddenChild = primaryChildFragment.child;
          while (hiddenChild !== null) {
            treeBaseDuration += hiddenChild.treeBaseDuration;
            hiddenChild = hiddenChild.sibling;
          }
          primaryChildFragment.treeBaseDuration = treeBaseDuration;
        }
         
        const fallbackChildFragment = createFiberFromFragment(
          nextFallbackChildren,
          mode,
          renderExpirationTime,
          null,