This hadith is transmitted on the authority of 'Ali, but he made no mention of" while in prostration".
Sahih Muslim Book 4, Hadith 243
← Previous Hadith The Apostle of Allah (ﷺ) forbade me to recite the Qur'an while I am in a state of bowing and prostration, and in their narration (there is a mention of) forbiddance from that (recital) in the state of prostration as it has been transmitted by Zuhri, Zaid b. Aslam, al-Wahid b. Kathir, and Dawud b. Qais.

Sahih Muslim Book 4, Hadith 242 Next Hadith → I was forbidden to recite (the Qur'an) while I was bowing, and there is no mention of 'Ali in the chain of transmitters.

Sahih Muslim Book 4, Hadith 244