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

Notice the flash. I'd expect `suspended` to be `true` during the high pri render.
return (
        <Suspense fallback="Loading...">
          <Text text="Sibling" />
          {shouldSuspend ? (
            <AsyncText ms={10000} text={'Step ' + step} />
          ) : (
            <Text text={'Step ' + step} />
          )}
        </Suspense>
      );
    }
    function interrupt() {
      
      
      ReactNoop.flushSync(() => {
        ReactNoop.renderToRootWithID(null, 'other-root');
      });
    }
    
    
    await ReactNoop.act(async () => {
      root.render(<App step={0} shouldSuspend={false} />);
    });
    await advanceTimers(1000);
    expect(Scheduler).toHaveYielded(['Sibling', 'Step 0']);
    
    await ReactNoop.act(async () => {