We were able to reproduce the issue in our environment while using 22.7 version of the API. Therefore, it has been logged as PDFNET-52178 in our issue tracking system. We will further look into its details and inform you as soon as it is resolved. Please be patient and spare us some time.
Thank you. Please also add functionality to monitor conversion progress in SvgSaveOptions. Current there is no function to do that. Other options like HtmlSaveOptions have that function so that user can monitor conversion progress.
We have logged a feature request as PDFNET-52183 in our issue tracking system to implement the functionality of monitoring conversion progress during PDF to SVG Conversion. The ticket is linked with this forum thread and you will be notified as soon as it is resolved. Please be patient and spare us some time.