Stylesheet Directives for DisplayFormular overwritten?

I'm trying to change the font of DisplayFormula, DisplayFormulaNumbered and InlineFormula in my stylesheet. So in the options inspector of the stylesheet under FormatingOptions->FontOptions I changed FontFamily to "Baskerville". Every other settings are left unchanged for now. I then saved the stylesheet, opened a new notebook and applied that stylesheet to the new notebook. After that, i created a new DisplayFormula cell. But the new font is not applied. When i open the options inspector of the new cell, under FormatingOptions->FontOptions->FontFamily it says

Dynamic[AbsoluteCurrentValue[EvaluationCell[], {StyleHints, "CodeFont"}]] 

, and not "Baskerville". If i want to change the font, i manually have to do that for every cell.

Changing fonts in the stylesheet works perfectly fine for all other cell types. Why are my settings overwritten in this case?

@Kuba had the same question here:

Why does Mathematica ignore my stylesheet for DisplayFormulaNumbered cells?

He suggests that the cell style should be declared for every screen environment. But

Cell[StyleData["DisplayFormula","Working"],FontFamily->"Baskerville",FontSize->14,PrivateFontOptions->{"FontPostScriptName"->"Automatic"}] 

yields the same result.

Any help would be greatly appreciated.

Best regards, Fabian.