The imam forgot the second prostration, so he concluded the prayer. When he was informed of the omission, he performed the remaining prostration and then concluded the prayer. What is the ruling?

Question:
Honorable Shaykh, may Allah grant you success. The questioner says: Our imam led us in prayer and forgot the second prostration in the final unit. One of the worshippers alerted him, but he did not understand what he meant. So he completed the prayer, recited the tashahhud, and concluded the prayer. Then, after he had concluded, he was informed of the omission. He returned and performed the remaining prostration and then concluded the prayer. Is his action valid?

Answer:
Yes, they return and return with him, and they perform the prostration and they perform the tashahhud, then the tashahhud after, after the prostration, then they conclude the prayer. It is not that he prostrates and concludes the prayer immediately; the rest of the tashahhud comes after it. No, the first tashahhud is not in its proper place; it is an error. Yes, he performs what he left out and what comes after it in the prayer. Yes.