About the connection behaviour of Arabic scripts

I want to overwrite the connection behaviour of Arabic letters. For example, the letter REH (U+0631) doesn’t connect to the following, and I want it to do. I prepared an initial form and a medial form for it, and wrote the init and medi rules in the OpenType Designer, but it still doesn’t connect.

Is this fixed in Unicode encoding? It is possible to edit the behaviour?


I also tested other RTL scripts like Avestan, and it doesn’t connect either. However in Latin and Greek, it works well.

Version: FC 11 and 15

Hello, the characters shown in the image do not contain init or medi, only isol or fina.

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