Fix EQS firing position: invalid BB vector check, AlreadyAtGoal fallback

- LastKnownTargetPosition check now filters FLT_MAX/InvalidLocation (not just zero)
- EQS result with AlreadyAtGoal triggers fallback advance instead of no-op
- bProjectGoal enabled for EQS move to handle NavMesh projection

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Unreal/PS_AI_Agent/Plugins/PS_AI_Behavior/Source/PS_AI_Behavior/Private/BT/PS_AI_Behavior_BTTask_Attack.cpp

@@ -227,8 +227,12 @@ void UPS_AI_Behavior_BTTask_Attack::TickTask(
 		{
 			// No LOS and idle → find a firing position
 			// Check if investigation (last known position) is active
+			// ClearValue sets vectors to FAISystem::InvalidLocation, not zero — must check both
 			const FVector LastKnownPos = BB->GetValueAsVector(PS_AI_Behavior_BB::LastKnownTargetPosition);
-			if (!LastKnownPos.IsZero())
+			const bool bHasLastKnown = !LastKnownPos.IsZero() &&
+				!LastKnownPos.ContainsNaN() &&
+				LastKnownPos.X < 1e30f; // Filter out FLT_MAX / InvalidLocation
+			if (bHasLastKnown)
 			{
 				// Investigation mode: go to last known position
 				AIC->MoveToLocation(
@@ -336,6 +340,7 @@ void UPS_AI_Behavior_BTTask_Attack::TickTask(
 				*AIC->GetName());
 		}
 	}
+
 }
 
 EBTNodeResult::Type UPS_AI_Behavior_BTTask_Attack::AbortTask(
@@ -427,20 +432,9 @@ void UPS_AI_Behavior_BTTask_Attack::OnFiringPositionQueryFinished(
 
 	AActor* Target = WeakTarget.Get();
 
-	if (Result.IsValid() && Result->IsSuccessful())
+	// Fallback lambda: advance directly toward target
+	auto FallbackAdvance = [&](const TCHAR* Reason)
 	{
-		const FVector FiringPos = Result->GetItemAsLocation(0);
-		AIC->MoveToLocation(
-			FiringPos, 50.0f, /*bStopOnOverlap=*/true,
-			/*bUsePathfinding=*/true, /*bProjectGoal=*/false, /*bCanStrafe=*/false);
-		Memory->bSeekingFiringPos = true;
-
-		UE_LOG(LogPS_AI_Behavior, Log, TEXT("[%s] Attack: EQS found firing position %s"),
-			*AIC->GetName(), *FiringPos.ToString());
-	}
-	else
-	{
-		// EQS found nothing — fallback: advance toward target
 		if (Target)
 		{
 			const float MidRange = (Memory->MinRange + Memory->MaxRange) * 0.5f;
@@ -449,9 +443,32 @@ void UPS_AI_Behavior_BTTask_Attack::OnFiringPositionQueryFinished(
 				/*bUsePathfinding=*/true, /*bProjectGoal=*/true, /*bCanStrafe=*/false);
 			Memory->bSeekingFiringPos = true;
 		}
+		UE_LOG(LogPS_AI_Behavior, Log, TEXT("[%s] Attack: %s, fallback advance toward target"),
+			*AIC->GetName(), Reason);
+	};
 
-		UE_LOG(LogPS_AI_Behavior, Log, TEXT("[%s] Attack: EQS no result, fallback advance"),
+	if (Result.IsValid() && Result->IsSuccessful())
-			*AIC->GetName());
+	{
+		const FVector FiringPos = Result->GetItemAsLocation(0);
+		const EPathFollowingRequestResult::Type MoveResult = AIC->MoveToLocation(
+			FiringPos, 50.0f, /*bStopOnOverlap=*/true,
+			/*bUsePathfinding=*/true, /*bProjectGoal=*/true, /*bCanStrafe=*/false);
+
+		if (MoveResult == EPathFollowingRequestResult::RequestSuccessful)
+		{
+			Memory->bSeekingFiringPos = true;
+			UE_LOG(LogPS_AI_Behavior, Log, TEXT("[%s] Attack: EQS moving to firing position %s"),
+				*AIC->GetName(), *FiringPos.ToString());
+		}
+		else
+		{
+			// AlreadyAtGoal or Failed — EQS position is too close or unreachable
+			FallbackAdvance(TEXT("EQS position unreachable or too close"));
+		}
+	}
+	else
+	{
+		FallbackAdvance(TEXT("EQS no result"));
 	}
 }
 

Unreal/PS_AI_Agent/Plugins/PS_AI_Behavior/Source/PS_AI_Behavior/Public/BT/PS_AI_Behavior_BTTask_Attack.h

@@ -48,6 +48,7 @@ public:
 	UPROPERTY(EditAnywhere, Category = "Attack|LOS", meta = (ClampMin = "0.1", ClampMax = "1.0"))
 	float LOSCheckInterval = 0.2f;
 
+
 	/**
 	 * EQS query asset for finding a firing position with clear LOS.
 	 * Compose in editor: OnCircle generator + LineOfSight filter + Distance tests.