The Port of Los Angeles is watching events closely in China as container ships stack up outside Chinese ports affected by new COVID-19 outbreaks and manufacturing shutdowns. After a year of cargo bottlenecks at the port, Executive Director Gene Seroka laid out his “wait and watch” strategy for what many industry experts say could upend the progress made on easing the supply chain. “There are a few unknowns here,” Seroka said during a March 16 press conference when asked about factory shutdowns in Shenzhen and other cities. “We’ll continue to watch this.” Shenzhen is the hub of electronics manufacturing in China, home to Tencent and Huawei Technologies. Cargo from South China represents about one-third of Los Angeles Port’s inbound cargo. The port’s officials will continue talking with friends and colleagues overseas and try to keep up with some other observations around factory strength so they can have a better look …