A wet dream occurs during sleep without the sleeper’s deliberate choice. The quoted ruling therefore leaves the fast intact.
If a ritual bath becomes necessary afterward for prayer, that is a distinct matter. Being required to perform ghusl does not by itself mean that a fast is invalid. Rules of purification and rules of fasting answer different legal questions.
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Kitab al-Sawm: Fasting Hours, Invalidators, Qada and Kaffarah
A wet dream occurs during sleep without the sleeper’s deliberate choice. The quoted ruling therefore leaves the fast intact.
If a ritual bath becomes necessary afterward for prayer, that is a distinct matter. Being required to perform ghusl does not by itself mean that a fast is invalid. Rules of purification and rules of fasting answer different legal questions.