Investors are still skittish after last week's actions against DiDi Global.Shares of Chinese electric-vehicle maker NIO were trading lower on Wednesday. Although investors' concerns about U.S.-listed Chinese stocks have lingered since the Chinese government took action againstDiDi Globaland other recently listed stocks last week, there was no immediately obvious trigger for Wednesday's decline.As of 2 p.m. EDT, NIO's New York-traded shares were down about 4.6% from Tuesday's closing price.Is tha