fix(Core/AI): Creature SetInCombatState Leashing. (#19889)

* Update Unit.cpp

* Update pit_of_saron.cpp

* Update Unit.cpp

src/server/game/Entities/Unit/Unit.cpp

@@ -13541,8 +13541,6 @@ void Unit::SetInCombatWith(Unit* enemy, uint32 duration)
             return;
         }
     }
-    if (Creature* pCreature = ToCreature())
-        pCreature->UpdateLeashExtensionTime();
 
     SetInCombatState(false, enemy, duration);
 }
@@ -13701,6 +13699,8 @@ void Unit::SetInCombatState(bool PvP, Unit* enemy, uint32 duration)
 
         if (enemy)
         {
+            creature->UpdateLeashExtensionTime();
+
             if (IsAIEnabled)
                 creature->AI()->JustEngagedWith(enemy);
 

src/server/scripts/Northrend/FrozenHalls/PitOfSaron/pit_of_saron.cpp

@@ -1130,7 +1130,7 @@ public:
             me->LoadCreaturesAddon(true);
             me->SetLootRecipient(nullptr);
             me->ResetPlayerDamageReq();
-            me->UpdateLeashExtensionTime();
+            me->ClearLastLeashExtensionTimePtr();
         }
     };