An imam who stood up for a fifth rak'ah and did not prostrate for forgetfulness

Question:
The questioner says: We prayed the 'Asr prayer with an imam who stood up for the fifth rak'ah, and the people recited the tasbih, but he did not return. After the taslim, he did not prostrate for forgetfulness. He said that he did not recite al-Fatihah in the fourth rak'ah, so he added the fifth rak'ah in place of it. Do we or he have to repeat the prayer?

Answer:
The imam is the guarantor; he is more aware of the situation. If he left the fourth rak'ah and sat for the third tashahhud, then he stands up and performs the fourth. If it was in the minds of those behind him that it was the fifth, it is the fourth, as the imam said. He is more aware of this. He is the guarantor and the one entrusted with the prayer, and it is obligatory for them to follow him if this is his situation and he is truthful in his statement. Yes, and he prostrates for forgetfulness. The one who forgets has a prostration for forgetfulness. Yes.

The presenter:
May Allah reward you.