More than 20,000 employees at Apple Inc supplier Foxconn's huge Chinese plant, mostly new hires not yet working on production lines, have left, a Foxconn source familiar with the matter told Reuters on Friday. The departures from the world's largest iPhone factory deal a fresh blow to the Taiwanese company that has been grappling with strict COVID-19 restrictions that have fuelled discontent among workers and disrupted production ahead of Christmas and January's Lunar New Year holiday. Concerns are mounting over Apple's ability to deliver products for the busy holiday period as the worker unrest lingers at the Zhengzhou plant, which...