What is the authenticity of the statement that the correct wording in the opening supplication (Du'a al-Istiftah) is "jidduk" (with a kasra on the jim) and not "jaduk" (with a fatha on the jim)?

The word "jadd-uk" (جدُّك) in the opening supplication (Du'a al-Istiftah) and in the Hadith "The might of the mighty will not benefit them against You" (لا ينفع ذا الجد منك الجد) is pronounced with an open "jim" (fatḥah on the jim). "Al-jadd" (الجدُّ) signifies greatness, majesty, good fortune, and wealth. Scholars have unanimously agreed on this pronunciation and meaning. Its occurrence with a broken "jim" (kasrah on the jim) is considered a distortion of the meaning and is incorrect. It is imperative to verify the accuracy of information before disseminating it, especially concerning legal rulings (Shar'i rulings) and Prophetic narrations (Hadiths).