وَيُخْفِي الْقِرَاءَةَ فِيمَا بَعْدَ الْأُولَيَيْنِ،
Meaning: Recite quietly in the rakahs after the first two.
This refers to the third of Maghrib and the third and fourth of Isha, not to an additional Fajr rakah.
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Source Text: After the First Two Rakahs
Rules of Audible and Quiet Recitation in Salah
وَيُخْفِي الْقِرَاءَةَ فِيمَا بَعْدَ الْأُولَيَيْنِ،
Meaning: Recite quietly in the rakahs after the first two.
This refers to the third of Maghrib and the third and fourth of Isha, not to an additional Fajr rakah.