Reproducible on demo XWiki Jetty/HSQLDB {{17.10.3}} with LibreOffice {{25.8.4.2}} with sample on this ticket.
However, if I create from scratch {{odt}} or {{doc}}, {{docx}} in LibreOffice with numbered headings level 1, level 2 and level 3 with lorem (type {{lorem}} and press {{F3}} to generate dummy text) content.
When importing this document into XWiki and selecting split pages by Heading 1 & 2 & 3, the result is:
* A parent wiki page titled {{Test 3}}, containing: ** two internal links of the page pointing to the child pages {{1One}} and {{2Next}} (both derived from Heading 1). * First two child pages: ** {{1One}} and {{2Next}}, each containing the content that follows its respective Heading 1 and in the end page {{1One}} has internal links pointing to sub-pages {{1.1Two}} and {{1.2Three}}. Page {{2Next}} has content and link to sub-page {{2.1Next}} * Next sub-child pages: ** {{1.1Two}} and {{1.2Three}} respective Heading 2 has their content ** {2.1Next}} respective Heading 2 has content with internal link to {{2.1Sub next}} - Heading 2, that page has link to last sub-page {{2.1.1Ending}} - Heading 3
I'd say behavior of splitting is expected if Document is created in LibreOffice and OnlyOffice (I've not tested I don't have it locally) since XWiki listens to such servers. And either it's issue specific to how LibreOffice XWiki with configurated office server converts/parses MicrosoftOffice document during importing to XWiki import or this limitation of usage XWiki with office files specificly created in MicrosoftOffice or Office365.
