Waṣl means reading through into the next word. The prohibited ghayr-ḥaddih meeting must then be resolved. Waqf means stopping at a word; the text explicitly recognizes permissibility of the meeting at a stop.
Therefore written vowelling alone does not decide the practical reading. First establish whether the words are being joined or whether a stop occurs.
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Why joining and stopping differ
Meeting of Two Sākin Letters — ʿAlā Ḥaddih, Ghayr Ḥaddih and Tanwīn
Waṣl means reading through into the next word. The prohibited ghayr-ḥaddih meeting must then be resolved. Waqf means stopping at a word; the text explicitly recognizes permissibility of the meeting at a stop.
Therefore written vowelling alone does not decide the practical reading. First establish whether the words are being joined or whether a stop occurs.