If the first tashrīʿ stop is valid but the second is incoherent, what follows?

Qalb, Tashrīʿ and Luzūm Mā Lā Yalzam: Completing the Verbal Ornaments

• Tashrīʿ is established
• It is necessarily perfect jinās
• It is necessarily luzūm
• The defining condition of tashrīʿ is unmet