Labubu dolls on display at a Pop Mart International Group Ltd. store in Shanghai, China.Raul Ariano/BloombergWang Ning, the founder of Chinese toy maker Pop Mart International Group, has seen his net worth plummet by almost $6 billion in less than a month – as the latest edition of the company’s Labubu series of dolls seems to be losing some traction in mainland China.The 38-year-old chairman and CEO now has a net worth of $21.6 billion largely based on a company stake, according to Forbes estimates. The am ...