useTracker renders two times at mount, would be nice if it renders only once

This code renders two times

```
    const Test = ({ afterMountInc = false }) => {
      renderCount++;
      console.log(renderCount);
      value = useTracker(() => {
        return null;
      }, []);
      return <span>{renderCount}</span>;
    };

    ReactDOM.render(<Test />, container);
```