Orleans 9.0 With Autofac IGrainExtension

[BoasE]

I upgraded a project to the current orleans version from 3.x
This project also uses autofac for dependency injection.

Now when I start the project, it throws a Argument.Null exception when calling
CreateHostBuilder(args).Build().Run(); and the source is Autofac.Core.Activators.ProvidedInstance.ProvidedInstanceActivator

After debugging into it I can see autofac tries to register the instance for IGrainExtensions

The code in the ProvidedInstanceActivator is and then register instance fails

 builder
                        .RegisterInstance(descriptor.ImplementationInstance) //Is Nulll
                        .As(descriptor.ServiceType)
                        .ConfigureLifecycle(descriptor.Lifetime, null);

The Registration was added by "UseOrleans()" and i dont have any Grainextensions by my own

In the debug view of the ServiceCollection I can see that it is indeed null

Is this some kind of incompability ? How can i do to avoid t his exception?