Is my prayer valid if I don't perform the prostration of forgetfulness (sujud al-sahw) with the Imam because I am certain he did not make a mistake in his prayer?

Congregants must follow the Imam in the prostration of forgetfulness (Sajdat al-Sahw), even if they do not know the reason for his prostration. This is because he might have omitted an obligatory verbal act or uttered a prescribed saying in the wrong place. If a congregant fails to follow the Imam in the prostration of forgetfulness, their prayer is invalidated according to some scholars, and they must repeat it. The cautious approach is to repeat the prayer in which the Imam's prostration was not followed.