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.
setCounter(c => c + 1);
          setSignal(newSignal);
        }
        const [label, _setLabel] = useState('A');
        setLabel = _setLabel;
        return <Text text={`${label}:${counter}`} />;
      }
      const root = ReactNoop.createRoot();
      root.render(<Foo signal={true} />);
      expect(Scheduler).toFlushAndYield(['A:0']);
      expect(root).toMatchRenderedOutput(<span prop="A:0" />);
      await ReactNoop.act(async () => {
        root.render(<Foo signal={false} />);
        setLabel('B');
      });
      expect(Scheduler).toHaveYielded(['Suspend!']);
      expect(root).toMatchRenderedOutput(<span prop="A:0" />);
      
      root.render(<Foo signal={false} />);
      expect(Scheduler).toFlushAndYield(['Suspend!']);
      
      
      root.render(<Foo signal={true} />);
      expect(Scheduler).toFlushAndYield(['B:0']);
      expect(root).toMatchRenderedOutput(<span prop="B:0" />);
    });
    
    it.experimental('calling startTransition inside render phase', async () => {
      let startTransition;
      function App() {