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.
const [text, _setText] = useState('A');
        setAppText = _setText;
        return (
          <>
            <Suspense fallback={<Fallback />}>
              <AsyncText text={text} />
            </Suspense>
          </>
        );
      }
      let setFallbackText;
      function Fallback() {
        const [text, _setText] = useState('Loading...');
        setFallbackText = _setText;
        return <Text text={text} />;
      }
      
      await resolveText('A');
      await ReactNoop.act(async () => {
        root.render(<App />);
      });
      expect(Scheduler).toHaveYielded(['A']);
      expect(root).toMatchRenderedOutput(<span prop="A" />);