If you're like a lot of us, you often show up early to Zwift group workouts to warm up or otherwise prepare. Since Zwift restarts your workout when you join the group ride, you may end up with a short file that links to your planned BaseCamp workout in TrainingPeaks and turns it orange or red, with the actual workout sitting off by itself. The solution to this is to unpair the short file from the planned workout and pair the actual workout file to it instead.
Coach Tim created this short video to walk you through the process. (You can read the full discussion in the Facebook group here.)