https://codesandbox.io/s/upbeat-frost-3tt25

1. Press Suspend, see "Loading..."
2. Wait five seconds, you'll see "Happy birthday" at some point 
3. You won't see it again no matter how long you wait

Expected: you'll see it every five seconds.
let [isLoading, setLoading] = React.useState(false);
      let start = React.useCallback(
        cb => {
          setLoading(true);
          Scheduler.unstable_next(() =>
            React.unstable_withSuspenseConfig(() => {
              setLoading(false);
              cb();
            }, config),
          );
        },
        [setLoading, config],
      );
      return [isLoading, start];
    }
    const SUSPENSE_CONFIG = {
      timeoutMs: 10000,
      busyDelayMs: 500,
      busyMinDurationMs: 400,
    };
    let transitionToPage;
    function App() {