Created attachment 197886 [details] Histrogram created with Excel 365 Open the attached file in LibreOffice 25.2. Although we now have a chart type "Histogram", the chart is not rendered.
Created attachment 197887 [details] Screenshot of the chart in Excel
I can repro on: Version: 25.2.0.0.alpha1+ (X86_64) / LibreOffice Community Build ID: afc441e65107ed808c399b65f4737d25541cdf77 CPU threads: 20; OS: Linux 5.14; UI render: default; VCL: kf5 (cairo+xcb) Locale: en-US (en_US.UTF-8); UI: en-US Calc: threaded
Created attachment 197890 [details] Screenshot opening with Calc, with a message on the chart. Reproducible. Version: 25.2.0.0.alpha1+ (X86_64) / LibreOffice Community Build ID: 44ccd392be12dad23e216fb3eb2c2e5b275eee75 CPU threads: 16; OS: Windows 11 X86_64 (10.0 build 26100); UI render: default; VCL: win Locale: es-ES (es_ES); UI: en-US Calc: CL threaded But there is a message about the chart type not being compatible with the Excel version. It opens with Excel and looks fine.
The reason for the message about the chart type not being compatible is because MSO has introduced an entirely new namespace for the new chart types introduced in MSO2016. Which is chartex rather than chart namespace https://epplussoftware.com/docs/5.7/api/OfficeOpenXml.Drawing.Chart.ChartEx.ExcelChartEx.html That's why we are seeing this message.
Actually it is xmlns:cx1="http://schemas.microsoft.com/office/drawing/2015/9/8/chartex" But the prefix cx1 is only used in Requires="cx1" The chart itself is still <cx:chart xmlns:cx="http://schemas.microsoft.com/office/drawing/2014/chartex" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" r:id="rId1" />