Text rendering problem using OpenType font and cursive lookups with mixed RIGHT_TO_LEFT flag

Hi,

I am developing an OpenType font with the following cursive feature.

feature curs {  
  lookup cursivejoinrtl;  # RIGHT_TO_LEFT flag set between Hah, Meem, Yeh and final Meem
  lookup rehwawcursive; # RIGHT_TO_LEFT flag clear between Waw and Hah
} curs;

Here is the rendering of the word وحميم in TextEdit.

Using HarfBuzz I got the following result.

The same rendering problem occurs when using Safari. It seems that is related to Core Text.

I reported the issue to Feedback Assistant over a year ago but haven't had a response yet. So I'm posting the problem on this forum.

Any support on this matter would be greatly appreciated.