BeAssignableTo does not work across multiple layers of inheritance and multiple assemblies

[tnotheis]

My ArchUnit tests test for assignability across multiple layers of inheritance, like so:

// Assembly 1
public class Parent;

// Assembly 2
public class Child : Parent;

// Assembly 3
public class Grandchild : Child;

// ArchUnit test
public class Tests
{
    private static readonly Architecture Architecture = new ArchLoader()
            .LoadAssemblies(typeof(Parent).Assembly, typeof(Child).Assembly, typeof(Grandchild).Assembly)
            .Build();
    
    [Fact]
    public void Test()
    {
        Classes().That().Are(typeof(Grandchild))
            .Should().BeAssignableTo(typeof(Parent))
            .Check(Architecture);
    }
}

(I created a minimal example, which you can find here: https://github.com/tnotheis/archunit-bug-example)

With version 0.11.0 this worked just fine. But since I upgraded to version 0.11.1, the test fails with the following error:

AssemblyOfGrandchild.Grandchild is not assignable to "AssemblyOfParent.Parent"

It only fails if Child and Grandchild reside in different assemblies. If you move the Grandchild class into AssemblyOfChild the test passes.