The feminine of سَكْرَانُ is سَكْرَى, not سَكْرَانَة. This is exactly the kind of contrast the author’s adjective condition addresses.
Thus sakrān is a diptote here: nominative ḍamma, accusative fatḥa, and ordinarily genitive fatḥa, without tanwīn.
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Sakrān and Its Feminine Sakrā
Diptote Causes — Additional Alif and Nūn and Their Conditions
The feminine of سَكْرَانُ is سَكْرَى, not سَكْرَانَة. This is exactly the kind of contrast the author’s adjective condition addresses.
Thus sakrān is a diptote here: nominative ḍamma, accusative fatḥa, and ordinarily genitive fatḥa, without tanwīn.