Fix handling of Area Guard mission for Speed=0 vehicles

- Separate the handling from Hunt, do not reassign to Guard and reimplement only the target acquisition from original Area Guard handling

Author: Starkku

YRpp

@@ -82,8 +82,7 @@ DEFINE_HOOK(0x73891D, UnitClass_Active_Click_With_DisallowMoving, 0x6)
 	return TechnoExt::CannotMove(pThis) ? 0x738927 : 0;
 }
 
-DEFINE_HOOK_AGAIN(0x744103, UnitClass_Mission_DisallowMoving, 0x6)	// UnitClass::Mission_AreaGuard
-DEFINE_HOOK(0x73EFC4, UnitClass_Mission_DisallowMoving, 0x6)		// UnitClass::Mission_Hunt
+DEFINE_HOOK(0x73EFC4, UnitClass_Mission_Hunt_DisallowMoving, 0x6)
 {
 	GET(UnitClass*, pThis, ESI);
 
@@ -93,7 +92,34 @@ DEFINE_HOOK(0x73EFC4, UnitClass_Mission_DisallowMoving, 0x6)		// UnitClass::Miss
 		pThis->NextMission();
 
 		R->EAX(pThis->Mission_Guard());
-		return R->Origin() == 0x744103 ? 0x744173 : 0x73F091;
+		return 0x73F091;
+	}
+
+	return 0;
+}
+
+// 3 Sep, 2025 - Starkku: Separated from above, do not change to guard mission
+// and only handle the target acquisition part of area guard for immobile units.
+DEFINE_HOOK(0x744103, UnitClass_Mission_AreaGuard_DisallowMoving, 0x6) 
+{
+	GET(UnitClass*, pThis, ESI);
+
+	if (TechnoExt::CannotMove(pThis))
+	{
+		if (pThis->CanPassiveAcquireTargets() && pThis->TargetingTimer.Completed()) 
+			pThis->TargetAndEstimateDamage(pThis->Location, ThreatType::Area);
+
+		int delay = 1;
+
+		if (!pThis->Target)
+		{
+			pThis->UpdateIdleAction();
+			auto const control = &MissionControlClass::Array[(int)Mission::Area_Guard];
+			delay = static_cast<int>(control->Rate * 900) + ScenarioClass::Instance->Random(1, 5);
+		}
+
+		R->EAX(delay);
+		return 0x744173;
 	}
 
 	return 0;