IFCAPI::PropertyAccessor::GetAttributes issue in custom add‑on

[larsr]

Hello!

Does the new IFCAPI have any prerequisites that need to be set in order to be used? The code provided below, if added to the example project IFC_Test, will print:

TestApi(): 1
TestApi(): 2
TestApi(): 3
Number of attributes: 6
Attribute Name0: GlobalId
Attribute Name0: Name
Attribute Name0: Tag
Attribute Name0: PredefinedType

However, the same code in my add‑on returns 0 attributes:

TestApi(): 1
TestApi(): 2
TestApi(): 3
Number of attributes: 0

Archicad version: 29.2.0 (5003)
SDK version: WIN.29.3100

Test function:

void TestApi()
{
	GS::Array<API_Neig> aSelection;
	API_SelectionInfo rSelectionInfo = {};
	ACAPI_Selection_Get(&rSelectionInfo, &aSelection, false);
	for (auto& rNeig : aSelection)
	{
		API_Elem_Head head{};
		head.guid = rNeig.guid;
		auto objectID = IFCAPI::GetObjectAccessor().CreateElementObjectID(head);
		//
		DBPrintf("TestApi(): 1\n");
		if (objectID.IsErr())
		{
			ACAPI_WriteReport("TestApi(): CreateElementObjectID failed for element ", true);
			return;
		}
		//
		IFCAPI::PropertyAccessor propertyAccessor = IFCAPI::PropertyAccessor(objectID.Unwrap());
		auto properties = propertyAccessor.GetAttributes();
		if (properties.IsErr())
		{
			ACAPI_WriteReport("TestApi(): GetAttributes failed for element", true);
			return;
		}
		DBPrintf("TestApi(): 2\n");
		//
		auto oIfcAttributes = properties.Unwrap();
		DBPrintf("TestApi(): 3\n");
		DBPrintf("Number of attributes: %zu\n", oIfcAttributes.size());
		//
		for (auto& rIfcAttribute : oIfcAttributes)
		{
			if (rIfcAttribute.GetName().IsEmpty()) continue;
			//
			if (!rIfcAttribute.GetValue().has_value()) continue;
			//
			DBPrintf("Attribute Name0: %s\n", rIfcAttribute.GetName().ToCStr().Get());
		}
	}
}

Operating system used: Windows 11 25H2