The remainder of the case where one catches the 'Asr prayer in the third rak'ah, and the imam prays two extra rak'ahs by mistake, and one prays with him: what is required of him?

The Shaykh : We said: He is a forgetful person and owes nothing. But you cannot add anything to the prayer, not even one prostration. However, I say to you: May Allah reward you, is this a real situation? I mean, is it possible for a person to pray two extra rak'ahs without noticing or being alerted? Answer: Ah, one rak'ah is possible, but to pray two rak'ahs while the people are behind him and they do not notice him? That is far-fetched.

The questioner : But the follower in this case leaves the first tashahhud? The follower?

The Shaykh : He leaves the first tashahhud following his imam. Are you not, if you entered with the imam in the second rak'ah of the Zuhr prayer, going to recite the tashahhud in a place where it does not belong, and leave the tashahhud in its proper place? Did you visualize this? Did you all visualize this, my brothers?
I came in and the imam had already prayed one rak'ah in the Zuhr prayer, so I entered with him. When does the imam sit? For me, he sits in the first rak'ah, which is the second rak'ah for me. He stands up and does not sit. So you find that I recited the tashahhud in a place where it does not belong and left the tashahhud in its proper place. All of this is following the imam. Yes.