The source treats the preposition مِنْ as a special case: when the following word begins with a sākin in liaison, its nūn receives fatḥah, as in مِنَ اللَّهِ.
This is not the default kasrah rule for all non-madd consonants. The source also cites the connected reading of الٓمٓ اللَّهُ, where the ending mīm is read with fatḥah. Both are specific environments described by the text.
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The special case of the preposition min
Meeting of Two Sākin Letters — ʿAlā Ḥaddih, Ghayr Ḥaddih and Tanwīn
The source treats the preposition مِنْ as a special case: when the following word begins with a sākin in liaison, its nūn receives fatḥah, as in مِنَ اللَّهِ.
This is not the default kasrah rule for all non-madd consonants. The source also cites the connected reading of الٓمٓ اللَّهُ, where the ending mīm is read with fatḥah. Both are specific environments described by the text.