In a defective sale (bayʿ fāsid), the transaction is recognized in its basic kind but contains a prohibited feature or condition. Possession and later dealings with the acquired item must be assessed under the relevant rules.
Delivering some property may satisfy an aspect of liability without meeting every condition associated with a sound sale and its attendant rights.
Distinction: Acquiring legal title, delivering an obligation in full, and being released from all consequences of a transaction are three different questions. They must not be collapsed into one.