Still reproducible on 2026-10-29 with XWiki 18.10.0-SNAPSHOT and LibreOffice 25.2.3, converting importing the attached 73284.xls with the {{HTML (StarCalc)}} filter style filtering enabled. Cell borders were made visible to show the table structure.
WhenLibreOffice exports the spreadsheet to HTML, it places each chart inside a merged cell ({{colspan=9 rowspan=11}} and {{colspan=11 rowspan=9}}). This extends the results table with about 10 rows of empty cells, highlighted in red.
On the XWiki side, the The office importer's keeps them: {{TableFilter}} only removes {{<tr>}} elements that have no children, so and these rows survive the import contain empty cells. It also removes
For reference, the raw LibreOffice HTML output (filter {{rowspanHTML (StarCalc)}} of every cell in a row that contains one), including the with cell borders made visible:
!XWIKI-3217-spurious- cells holding the charts, which degrades the layout further.png|thumbnail!
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