Not all of the works attributed to Zayd ibn Ali are the work of Zayd himself, but that does not mean that these works are fake.
The second group of works attributed to Zayd are valuable, that is, some of these works are narrations that have been collected in later centuries and attributed to Zayd. In other words, some of these works are narrations collected by Zayd's own direct disciples and attributed to Zayd. These works seem to be important enough and we do not need to consider them worthless. One of the main books of this group is a collection of hadiths - I will not give any name to it - which was collected from Zayd ibn Ali and their narrator is a person named Abu Khalid Wasiti. Abu Khalid Wasiti is personally a Zaidi and is one of the main companions of Zaid, that is, as much as Zararah is known to us among the companions of Imam Ja'far Sadegh (عليه السلام), he is also known among the companions of Zaid and it can be said that no one is better known than him.
So because Abu Khalid, who is one of the main students of Zayd, has compiled this collection, this work is very valuable. It is a collection of news and hadiths narrated by Zayd from his fathers - generally from the person of the Prophet ((صلى الله عليه وآله وسلم)) and the Commander of the Faithful (عليه السلام). Through his fathers - he has collected in one collection and it seems to be a valuable and important collection. This collection has different names. In the Zaydi tradition, this book is called "Al-Majmoo '", but among the Sunnis, because the name of Musnad is very common, this work is called "Musnad of Zayd Ibn Ali". In recent centuries, the Zaydis have preferred to refer to this book as the musnad of Zayd ibn Ali.