China’s state support for its stock markets may face a test, as seasoned US hedge fund manager Michael Burry increased bearish wagers on artificial intelligence-linked stocks and Moody’s warned of debt risks from hyperscalers. Burry, famed for his prescient short against the US property market before the 2008 global financial crisis, expanded positions against Nvidia, Micron Technology and an exchange-traded fund tracking the Philadelphia Semiconductor Index. Moody’s cautioned last week that...