I also am having problems with the implementation of OpenType. This is still unresolved, and there is another problem that I have found (I do not know if this is just with the font or not, but this OpenType feature works in LibreOffice): the historical ligatures are not all applied (I am using the Italics version). At least the s-t ligature is not working (and I am using the regular s, for which the ligature is similar to c-t ligature, and not long-s).
Biblio