add_fallback for greek/cyrillic Glyphs both regular and italic

[urshofer]

I'm stuck with the following problem:

Got the following fallback defined:

\directlua {
	luaotfload.add_fallback
		("myfallback", {
			"NotoSans:mode=harf;script=grek;",
			"NotoSans:mode=harf;script=cyrl;",
			"NotoSansItalic:style=Italic;mode=harf;script=grek;",
			"NotoSansItalic:style=Italic;mode=harf;script=cyrl;",			
			"NotoSansBengali:mode=harf;script=bng2",
			"Noto Sans CJK SC:mode=harf;script=hani;",
			"Noto Sans CJK JP:mode=harf;script=kana;",
			"NotoColorEmoji:mode=harf;",
			"Harmattan:mode=harf;script=arabic;"
		})
}

using it like:

\newfontfamily\Diatype{ABCDiatype}[
	Extension   = .otf,
	UprightFont = *-Regular,
  	BoldFont 	= *-Bold,
	ItalicFont  = *-RegularItalic,
	BoldItalicFont  = *-BoldItalic,		  
	RawFeature=+onecb;+sixcb;+ninecb;+ss01,
	RawFeature={fallback=myfallback}
 ]

Missing greek glyphs are correctly substituted unless typeset as emphasized text \emph{…}.

How is it possible to add a fallback for Italic as well?

A fallback like this works as well, but sets all greek glyphs to italic, which is of course correct:

\directlua {
	luaotfload.add_fallback
		("myfallback", {
			"NotoSansItalic:mode=harf;script=grek;",
			"NotoSansItalic:mode=harf;script=cyrl;",			
			"NotoSansBengali:mode=harf;script=bng2",
			"Noto Sans CJK SC:mode=harf;script=hani;",
			"Noto Sans CJK JP:mode=harf;script=kana;",
			"NotoColorEmoji:mode=harf;",
			"Harmattan:mode=harf;script=arabic;"
		})
}

Is there a switch, an option I'm missing?

Thanks