It seems something changed between Aspose.PDF 20.6 and 20.7 causing incorrect colors to render in the background of some items when converting mht to pdf/tif.
HTMLConversions.zip (270.5 KB)
So far, it seems to happen with equations and certain embedded word are graphics.
We were able to notice the issue in generated PDF (after MHT to PDF Conversion) at our side. Therefore, we have logged it under the ticket ID PDFNET-48608 in our issue tracking system for correction. We will check this issue further and inform you as soon as it is resolved. Please spare us some time.
We are sorry for the inconvenience.