Looks like equations show up as AutoShape with picture of the equation set as picture fill background. When rotation of the shape is 0 in Power Point, this works correctly. When rotation is applied, the image gets distorted.
See attached source pptx and resulting svg
Svg was generated by calling WriteAsSvg on the shape object.
using (System.IO.StreamWriter file = new System.IO.StreamWriter(“e:\out.svg”))
When background picture gets saved, it shows the equation already rotated (as if it was a slide screenshot).
I’m using Aspose.Slides.NET 19.2.0