QuestionRelevant analysisWhy is the act prohibited?Whether prohibition attaches to the act itself or an added featureWere the essential contractual elements present?Conditions of legal formationDoes any legal effect remain?Detailed consequences of invalid and corrupt transactions
All three questions may apply to the same act. Giving one short answer for all three conflates different legal inquiries.
Hanafi discussions of a corrupt sale may recognize particular consequences following possession, but this does not validate every consequence of every defective contract. The conclusion remains conditional and case-specific.