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 timeoutID = useRef(-1);
        useEffect(() => {
          return function unmount() {
            clearTimeout(timeoutID.current);
          };
        }, []);
        const debouncedCallback = useCallback(
          (...args) => {
            clearTimeout(timeoutID.current);
            timeoutID.current = setTimeout(callback, ms, ...args);
          },
          [callback, ms],
        );
        return useCallback(debouncedCallback, inputs);
      }
      let ping;
      function App() {