I never saw any follow up on this and googled today to see if there was ever an explanation... according to the below article something with the propellers? Can someone explain from the article below what it may have been?
ktbs (DOT) com/news/propeller-problem-caused-2019-plane-crash-that-killed-carley-mccord-ensminger-report-suggests/article_24634444-1727-11ec-8534-07f0a8414123.html