Created attachment 197641 [details] Example with 'Of-Pie' chart Open attached document. It has a chart of type 'Of-Pie' with sub-type 'Bar-of-pie Chart'. Set LibreOffice to save to a strict (that is not extended) ODF version. Save the document. Unpack the saved document and examine the content.xml file of 'Object 1', that is the chart object. Error: The element <chart:chart> has an attribute 'sub-bar="true" '. Such attribute does not exist in ODF. The error is in line #1292 in xmloff/source/chart/SchXMLExport.cxx where an attribute in loext namespace is written without check whether the current ODF version is really an extended version. How to check the current ODF version can be seen in line #1258. But I have principle concerns about the way, the new chart types are handled in regard to ODF.
My concerns are listed in bug 163921.
Set ODF format version to 1.4 in Tools - Options - Load/Save - General, saved and unzipped. I confirm that Object 1/content.xml has sub-bar="true" attribute in the chart:chart element. Arch Linux 64-bit Version: 26.8.0.0.alpha0+ (X86_64) Build ID: 19f943f13485918d35597be1dcae48c0fbecd0e3 CPU threads: 8; OS: Linux 6.18; UI render: default; VCL: gtk3 Locale: fi-FI (fi_FI.UTF-8); UI: en-US Calc: CL threaded Built on 31 January 2026