Export to Microsoft HTML Help loses source formatting

After the most recent update, CHM outputs are defaulting to Times New Roman formatting for all paragraph styles (most styles should be in some form of HelveticaNeueLT). Tables are missing all formatting, and are practically incomprehensible. The styles only seem to be corrected by exporting a CSS and adding/editing those styles, then mapping them in the .STS file after importing the new CSS. I feel like I'm missing something obvious - is there not a better way to just use the source Paragraph/Character/Table Styles?