If I place the insertion cursor next to the paragraph end mark where the section break resides, the Style toolbar on the Ribbon says “Heading 1”. If I then press the Del key, the section break is removed. If I go back to the same paragraph end mark, the Style toolbar on the Ribbon says “Normal”. The style of that paragraph got changed automatically by removing the section break on its own. I might be wrong but I see a link between the style of that paragraph and the “associated” section break.