Even when the first sākin is a madd letter, a following sākin in the next word means the two are not within one word: this is ghayr ḥaddih. Likewise, a non-madd first sākin makes it that category.
Do not assume that all meetings of two vowelless letters receive one identical treatment. First identify the kind of first letter and whether the meeting crosses a word boundary.
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Different words and the forbidden meeting
Meeting of Two Sākin Letters — ʿAlā Ḥaddih, Ghayr Ḥaddih and Tanwīn
Even when the first sākin is a madd letter, a following sākin in the next word means the two are not within one word: this is ghayr ḥaddih. Likewise, a non-madd first sākin makes it that category.
Do not assume that all meetings of two vowelless letters receive one identical treatment. First identify the kind of first letter and whether the meeting crosses a word boundary.