They're running it with the rake of Meerut Vande Bharat (most probably) hence extension from Lucknow side was not possible. Also they are taking it back early morning which will not attract many passengers.
please wait...Translate to HindiWo Meerut Vande Bharat ke rake se chalaye ja rahe hain (shayad), isliye Lucknow side se extension nahin ho paya. Aur woh subah jaldi vapas le ja rahe hain, jisse zyada passengers nahin aayenge.