When a word ends in ordinary fath tanwin, stopping generally replaces the connected tanwin n with an alif-like long vowel, as with nisāʾan.
This must not be confused with stopping on other tanwin endings or ta marbuta.
The joined and stopped pronunciations are different.
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Essential Miscellaneous Rules: Qur’anic Orthography, Pauses and Special Words
When a word ends in ordinary fath tanwin, stopping generally replaces the connected tanwin n with an alif-like long vowel, as with nisāʾan.
This must not be confused with stopping on other tanwin endings or ta marbuta.
The joined and stopped pronunciations are different.