Eating after true dawn prevents a normal fast from being retroactively created by a later intention. Permission to form intention in the morning is not permission to eat and then count the preceding hours as fasting.
Always read the later-intention dispensation with the requirement that the person has abstained since dawn. Exceptional cases and remedial duties belong to later fasting lessons.
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Kitab al-Sawm: Categories of Fasting and Rules of Intention
Eating after true dawn prevents a normal fast from being retroactively created by a later intention. Permission to form intention in the morning is not permission to eat and then count the preceding hours as fasting.
Always read the later-intention dispensation with the requirement that the person has abstained since dawn. Exceptional cases and remedial duties belong to later fasting lessons.