Co-creators Matt Stone and Trey Parker announced that the fifth episode of season 27 has been canceled due to not meeting its deadline. The episode was set to air on Comedy Central, but instead, fans will have to wait three more weeks for episode six, which airs on October 15. This is not an unusual occurrence for South Park, as episodes often aren’t finalized until hours before broadcast.
Source: https://www.newsweek.com/entertainment/tv/south-park-abruptly-cancels-wednesdays-episode-2131490