Is it true that the intercession of those accompanying the deceased for the departed falls away if there is a polytheist among them, and what is the ruling on the presence of a monk or a priest among those accompanying the deceased?

This statement is incorrect and contradicts the words of the Almighty: "And no bearer of burdens will bear the burden of another." Perhaps this statement became mixed up with the Hadith of the Prophet, peace and blessings be upon him, which indicates that when forty Muslim men who do not associate anything with Allah pray over the deceased and supplicate for him, Allah accepts their intercession for him.