Remove heading from content when importing an Office document with heading split

Steps to reproduce

• In LibreOffice, create a document with several level 1 headings such as "Heading ABC" and "Heading DEF", add some paragraphs below each heading, then save the document in ODT format
• Create a page using type "Page from Office"
• In the "Office Importer" screen, select the ODT file you just created, check "Split document" along level 1 headings, and hit "Import"

Actual result

Two subpages are created (one for each section). Their title corresponds to the section heading as expected, however the level 1 heading is also present in the page content itself. For instance the first subpage title is "Heading ABC" and its content is "= Heading ABC =" followed by the paragraphs contained in the section.

Expected result

The subpage content should not contain the heading since it's already the page title.