Repro: https://codesandbox.io/s/fast-water-4i4jb

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
ReactNoop.discreteUpdates(() => {
          setAppText('C');
        });
        setFallbackText('Still loading...');
      });
      expect(Scheduler).toHaveYielded([
        
        'Suspend! [C]',
        'Loading...',
        
        'Still loading...',
      ]);
      expect(root).toMatchRenderedOutput(
        <>
          <span hidden={true} prop="A" />
          <span prop="Still loading..." />
        </>,
      );
    },
  );
  it(
    'regression: primary fragment fiber is not always part of setState ' +
      'return path',
    async () => {
      
      
      
      const {useState} = React;
      const root = ReactNoop.createRoot();
      function Parent() {