The ruling on the prayer of one who returns to the middle tashahhud before fully standing up

Question:
May Allah reward you with good and do you well. From the Kingdom of Bahrain, a message signed by one of our sisters from there, Umm 'Abd al-Rahman. Umm 'Abd al-Rahman has seven questions. In one of her questions, she says: If I stood up after the prostration in the second rak'ah of a four-rak'ah prayer, and before I was fully upright, I remembered that I had not sat for the first tashahhud, so I sat down and completed the prayer. Do I have to perform the prostration for forgetfulness?

Answer:
If she stood up and moved from the sitting position, then returned before she was fully standing, she must perform the prostration for forgetfulness, because she moved and shifted, thereby adding a movement and a standing to the prayer. She is required to perform the prostration for forgetfulness for this addition. However, if she did not move from the sitting position, but only moved to stand up, and then remembered while her limbs had not left the sitting position, she does not have to perform the prostration for forgetfulness. Yes.