The ma'mum's prostration for forgetfulness when he disagrees with his imam's opinion

Question:
He says: Honorable Shaykh, may Allah grant you success. Among the cases where the prostration for forgetfulness becomes obligatory for the ma'mum is if he sees that it is obligatory but the questioner did not see it. Is it not the default that the ma'mum follows his imam and does not differ from him? As was reported from some of the Salaf that disagreement is a condition?

Answer:
This is a difference of opinion; this is acting on evidence. Did he see that the prostration for forgetfulness is obligatory based on evidence? Based on evidence. Nothing is obligatory without evidence. If you have evidence, or you act on evidence, even if the imam left it out. For example, if the imam washes his hands during the prayer, and the ruling regarding the Sunnah of folding the hands is not established, and folding the hands in prayer is a confirmed Sunnah, a sound hadith, then you keep your hands folded. No, folding the hands, this is an act