I posted a reply on this thread but it seems it has been deleted…
I have the exact same problem with a customized SmartArt which makes the Aspose output to be corrupted. The problem can be reproduce just by loading the Document and saving it (cf. the attached files for the sample and the output).
If the SmartArt is “reset” the issue is not present anymore but it should work if the content is customized with specific color or fonts.
I’m using Aspose.Words 17.6.0.