SERVERPROPERTY('IsClustered') does not return the correct value in a cluster configuration

Hi all!

I'm testing some t-sql SQL properties for a data collection project and I got a strange case with the query below:

	SELECT 

		SERVERPROPERTY(''MachineName') AS [MachineName], 
 		SERVERPROPERTY('ServerName') AS [ServerName],  
 		SERVERPROPERTY('InstanceName') AS [Instance], 
 		SERVERPROPERTY('IsClustered') AS [IsClustered], 
 		SERVERPROPERTY('ComputerNamePhysicalNetBIOS') AS [ComputerNamePhysicalNetBIOS], 
 		SERVERPROPERTY('Edition') AS [Edition]

I have two test instances of SQL Server 2019. They both belong to a cluster without shared storage, as the availability groups allow it: SQLAGCLU

I don't understand why the query is returning "incorrect" properties. I expected them to have the value 1 for the "IsClustered" column. From the query that I use, I have no idea witch SQL instance are in a cluster...

Some one can give a feedback about it?
Thanks ALEN