Based on the photos quite clearly showing a feathered port engine, I would dare to suggest that the right wingtip struck the ground/runway during the inversion sequence due to an engine out at go-around, and was not the cause but already an effect.
On the TPE331 Engine the Prop will feather if the engine shuts down. During normal shut down the Pilot selects HP fuel off and then selects power leaver towards reverse, holds it so the pitch locks in fine. The prop seen in feather does not give 100% indication that it was in feather when the aircraft was still flying.