AddSingleton does not work as expected

Describe the bug
When we register tool like AddSingleton(type, instance) and pass a singleton instance, it seems that the instance is being ignored and the library creates a new instance when it needs it.
I tried also AddSingleton using a factory method like this:
services.AddSingleton(toolType, provider => Activator.CreateInstance(toolType, this.m_compositionService));
A breakpoint to Activator.CreateInstance was never hit and the tool just created the instance of the tool.

To Reproduce
Steps to reproduce the behavior:
1.

Expected behavior
A clear and concise description of what you expected to happen.

Logs
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Additional context
We discussed the issue over email. Please feel free to contact me there if you need additional information. Thanks!

Inizia riproducendo le registrazioni segnalate di AddSingleton(type, instance) e della factory nella configurazione dei servizi dell’SDK, utilizzando il tipo di tool fornito e il percorso Activator.CreateInstance. Confronta se, quando viene creato il tool, viene richiamata l’istanza registrata o la factory; il lavoro è completato quando entrambe le forme di registrazione vengono rispettate invece di creare silenziosamente un’altra istanza.