We have already talked about contradiction of shias in regarding of Yahya al-Qattan.
Just want to add more info which was gathered by our brother.
بسم الله العظيم
al-Najashi one of their lords and the biggest scholar of Rijal has authenticated one of the most famous Nasibis and enemies of Ahlul-Bayt (ra) in his book “Rijal al-Najashi” page 443.
He authenticated there – Yahya bin Sa’eed al-Qattan (abu Zakariya) . He said: “Yahya bin Sa’eed al-Qattan, Commoner (Sunni), Thiqah”
Now what does Ayatullah Muhammad al-Sanad say about Imam Yahya in his book “al-Ijtihad wal-Taqleed fi ‘ilm al-Rijal” page 317:
يحيى هذا من النواصب
“This Yahya is from the Nawasib”
عداوة يحيى بن سعيد لأهل البيت و حقده عليهم , و قد طعن في عشرات الرواة لأنهم يتشيعون أو لأن عندهم هوى التشيع
“Yahya bin Sa’eed had enmity towards Ahlul-Bayt and he had a grudge against them, he attacked many narrators because they had some shi’ism or because they leaned towards it”
Now a much bigger scholar sheikh al-Shari’ah al-Isfahani in his book “al-Qawl al-Sirah fil Bukhari wa Sahihihi al-Jami’i” page 40 says about him:
ويحيى بن سعيد ، الذي هو أقدمهم وأعلمهم بالنصب والانحراف عن أهل البيت – عليهم السلام
“Yahya bin Sa’eed who is the oldest and the best in Nasb and in his deviance from the path of Ahlul-Bayt (as)”
Another Shia scholar of Hadith Ja’afar al-Subhani in his introduction of al-Qawl al-Sirah criticizes Bukhari for not narrating from Ja’afar al-Sadiq and according to him this is because:
لتأثره بأمثال يحيى بن سعيد الناصبي
“Because he was influenced by the likes of Yahya bin Sa’eed the Nasibi.”