Steps to reproduce:
1. Start Libre Office writer. Create a new text document. Add a section. Add some text e.g. 'Content of section 1' into the section. Add another section. Add some text e.g. 'Content of section 2' into it. Save the document.
2. Start Accerciser accessibility explorer.
3. Go to the accessible tree view at top left. As shown in attached screen-shot, select the accessible object corresponding to the document just created. The tree shows only paragraphs under the document. There are no accessible container objects corresponding to the sections.