Decreasing to critical: contrary to what I originally reported, the issue is not coming from jodconverter but from LibreOffice itself who dropped the feature to export images as part of PPT export (see https://bugs.documentfoundation.org/show_bug.cgi?id=105303). There's not much we can do on XWiki side for now for this: we might find solutions with jodconverter and custom filters maybe, but this will take time.
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