Shortly before creating a scene beat and prose to begin Chapter 13, I had previously added and deleted several scenes from Chapter 12. Also I had moved some scenes around in the write interface within Chapter 12 using cut/paste for the prose and dragging the scene beats from one Chapter 12 scene to another to follow the prose which had been generated by that beat. Moving the scene beats in this way resulted in duplicated scene beats, requiring me to delete the original scene beat. I believe scene beat duplication is another defect, but not the one I'm reporting on here.