[NTG-context] rendering arabic diacritics

[seyal.zavira@gmail.com]

Hi all,

when i want to use the linked font for arabic texts it doesn't render diacritics properly
i doesn't have problem with this font in inkscape or libreoffice
what featureset should i apply?

font link:
https://drive.google.com/file/d/1hCcv6wqWjd-5GEKnaowh8E8YVbTgGqQr/view?usp=sharing

this is my MWE:
\definefontfeature [arabis]
     [mode=node,language=dflt,script=arab,
   init=yes,medi=yes,fina=yes,isol=yes,
   liga=yes,dlig=yes,rlig=yes,clig=yes,
   mark=yes,mkmk=yes,kern=yes,curs=yes]
\definefont [Ahang] [file:Ahang-Regular.otf*arabis at 18pt]
\setupalign[r2l]
\starttext
{\Ahang تَشْكِيل  كَسْرَة}
\stoptext
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