Sandbox: https://codesandbox.io/s/cranky-kapitsa-op3jh

Repro: type "a" and then after a second "b"

Expected: Eventually you'll see "ab" in all fields. Pending "..." indicator goes away.

Actual: You'll keep seeing "a" in low pri field. Pending "..." indicator is stuck.
await ReactNoop.act(async () => {
        setAppText('B');
      });
      expect(Scheduler).toHaveYielded(['Suspend! [B]', 'Loading...']);
      
      await advanceTimers(250);
      expect(root).toMatchRenderedOutput(
        <>
          <span hidden={true} prop="A" />
          <span prop="Loading..." />
        </>,
      );
      
      
      
      await ReactNoop.act(async () => {
        ReactNoop.discreteUpdates(() => {
          setAppText('C');
        });
        setFallbackText('Still loading...');
      });
      expect(Scheduler).toHaveYielded([
        
        
        
        'Loading...',
        
        'Suspend! [C]',