Have read a Telegraph article where it says the refs have been told that anyone not having their feet under their hips cannot be supporting their own weight.
Just watched where Jack gets pinged for "not supporting his weight", yet the video shows he was. The commentator discussion was about the feet/hips position
This indicates that players like Jack, who are able to support their weight in a way that you usually only see in gymnasts, not rugby players, is likely to be penalised unfairly in future.