American companies doing business in China are less optimistic about the future than at any other time in more than two decades. Restrictions on economic data, like the extent of youth unemployment, is making investment decisions harder. Few of the many foreign executives who left China during the pandemic are returning. These are some of the takeaways from reports released Tuesday by organizations representing close to 2,000 European and American firms. The papers by the American Chamber of Commerce in Shanghai and the European Union Chamber of Commerce in China…