Why Did Yahya Bin Sa'eed Declare Dhahak Bin Muzahim As A Weak Narrator Of Hadith?

Dhahak Bin Muzahim is one of the most reliable narrators who has narrated many narrations in many hadith collections. He has been declared a strong narrator by many hadith scholars. He is one of the senior narrators of the hadith and he can be found in Sunan Abu Dawud and Jami' At-Tirmidhi. He has been declared reliable by many scholars like Yahyah bin Ma'in, Abu Zurʽa al-Razi, Ibn Hajr Al-Asqalani, Darqutni, Imam Ahmad Bin Hanbal, etc. It looks like Dhahak Ibn Muzahim has already been declared reliable by Imam Bukhari as well:- ## **However, why did Yahyah bin Sa'eed declare him weak?**