Still reproducible on 2026-10-29 with LibreOffice 25.2.3, converting the attached 73284.xls with the HTML (StarCalc) filter. Cell borders were made visible to show the table structure.
LibreOffice 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 office importer's TableFilter only removes <tr> elements that have no children, so these rows survive the import. It also removes the rowspan of every cell in a row that contains one, including the cells holding the charts, which degrades the layout further.
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