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.
workInProgress.child = row;
            break;
          }
          const nextRow = row.sibling;
          row.sibling = ;
           = row;
          row = nextRow;
        }
         
        initSuspenseListRenderState(
          workInProgress,
          true,  
          ,
          null,  
          Mode,
          workInProgress.Effect,
        );
        break;
      }
      case 'together': {
        initSuspenseListRenderState(
          workInProgress,
          false,  
          null,  
          null,  
          undefined,
          workInProgress.Effect,
        );
        break;