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Sew ups are well known for the "leak" to be away from the actual spot of the leak. Air (like water) seeks the path of least resistance. Think of the leaking toilet on the second floor that drips a room away on the first floor. The water runs along a joist and to a low point before pooling and thus dripping through the ceiling. same for air in a sewn casing. It may well be That the air is traveling inside the casing till a gap to the outside world is found.
This and other reasons is why many give up on sew ups after a few non repairable flats. Andy
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