If your site runs Articulate Rise (or other xAPI content) in LearnDash with Tin Canny as your LRS, you may hit intermittent failures where courses show incomplete even though learners finished them.

add_action( 'learndash_topic_completed', array( __CLASS__, 'check_learndash_topic_completed' ), 20, 1 ); //add_action( 'learndash_lesson_completed', array( __CLASS__ ...