Strange behavior of ServiceDescriptor.ServiceType?

[wgross]

The following thing happened to me today:
I've written an extension method to register a custom implementation of Microsoft.AspNetCore.Authorization.IAuthorizationHandler at the service collection of a web service.
The handler is registered like this:

services.Add(new ServiceDescriptor(typeof(IAuthorizationHandler), typeof(SinIntAuthorizationHandler), ServiceLifetime.Singleton));

I've put the extension method and my implementations into a Library project/NuGet package for reuse.

If I call the extension method from the web services Startup and look into my service collection where I'm finding a service descriptor having:
ServiceType == ImplementatonType == SinIntAuthorizationHandler !

This doesn't work because the middleware searches for ServiceType == IAuthorizationHandler
If I'm moving the code of the extension method to the service project it works perfectly: ServiceType is IAuthorizationHandler!

It also works if I'm using the Library as a project reference directly instead of using the NuGet package.
I've checked the Assembly versions. In both cases (service project and library project) I'm referencing

Microsoft.Extensions.DependencyInjection.Abstractions, Version=1.1.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60
Microsoft.AspNetCore.Authorization, Version=1.1.2.0, Culture=neutral, PublicKeyToken=adb9793829ddae60

[wgross]

My fault obvioulsy.
I'v recreated the Nuget Package without cleaning the nuget cache and ALWAYS got an old buggy one
after cleaning the caches it work fine....facepalm