In the final two rakahs of a four-rakah obligatory prayer, al-Fatihah alone is the established Hanafi form. Additional Quranic recitation does not invalidate the prayer, though adding a surah is the usual sunnah in the first two rakahs.
Khas-satan describes the recommended pattern, not an automatic invalidity from extra verses.
Opening interactive controls...
Second Rakah, Sitting, Tashahhud and Taslim
In the final two rakahs of a four-rakah obligatory prayer, al-Fatihah alone is the established Hanafi form. Additional Quranic recitation does not invalidate the prayer, though adding a surah is the usual sunnah in the first two rakahs.
Khas-satan describes the recommended pattern, not an automatic invalidity from extra verses.