I thought this bug had been resolved but I find that adding formatting to the target still erases source formatting. See images. Lately I had just been adding the formatting after exporting, but it is not always convenient.
Issue: The grey font is replaced by a black font when the superscript and the italic are added.
There is work in progress on the addition of custom marking/highlighting with the chosen color for Word documents. It also should improve handling of custom tags inside colored text.