When embedding some font files, the presentation will show an error dialog about failed decompression of font files. I’ve added an example, where two fonts are okay, whereas two other fonts raising errors. The supplied fonts are from Google Fonts.
EmbeddedFont.pptx.zip (630.5 KB)
FontEmbedding.zip (879.1 KB) VS Solution
The VS Solution is importing the latest nuget package (20.12.0).