What is the ruling on the prayer of one who recited a verse containing a prostration, then performed two prostrations, then recited Al-Fatihah and completed the recitation after the prostration?

The prostration of recitation (Sujud At-Tilawah) is a single prostration by agreement of the jurists. If a worshiper intentionally adds an extra prostration, their prayer becomes invalid. If the addition was due to ignorance or forgetfulness, then they must perform the prostration of forgetfulness (Sujud As-Sahw), and their prayer is valid. Even if they do not perform the prostration of forgetfulness, their prayer is still valid.