If the last letter bears shaddah, stopping does not erase the doubling. The doubling is retained even when an eligible pausal technique such as rawm or ishmam is used.
A final vowel may change or be suppressed, but the doubled consonant must not be reduced to a simple consonant.
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Essential Miscellaneous Rules: Qur’anic Orthography, Pauses and Special Words
If the last letter bears shaddah, stopping does not erase the doubling. The doubling is retained even when an eligible pausal technique such as rawm or ishmam is used.
A final vowel may change or be suppressed, but the doubled consonant must not be reduced to a simple consonant.