Unable to resolve from ChildContainer when using singleton

[Josch600]

We ran into a problem using Unity.Container 5.11.11 and Unity.Abstraction 5.11.7, which I could isolate to the follwing code:

namespace UnitTests
{
    using FluentAssertions;
    using Unity;
    using Unity.Lifetime;
    using Xunit;


    public interface Interface1 { }
    public interface Interface2 { }
    public interface Interface3 { }

    public class Class1 : Interface1 { }

    public class Class2 : Interface2
    {
        public Class2(Interface1 param) { }
    }

    public class Class3 : Interface3
    {
        public Class3(Interface2 param) { }
    }

    public class UnitTest1
    {
        [Fact]
        public void Resolve_Interface3FromMainContainer_GetsClass3()
        {
            var unityContainer = new UnityContainer();

            unityContainer.RegisterType<Interface1, Class1>();
            unityContainer.RegisterType<Interface2, Class2>(new SingletonLifetimeManager());
            unityContainer.RegisterType<Interface3, Class3>();

            // works fine
            unityContainer.Resolve<Interface3>().Should().BeOfType<Class3>();
        }

        [Fact]
        public void Resolve_Interface3FromChildContainer_GetsClass3()
        {
            IUnityContainer mainContainer = new UnityContainer();
            var unityContainer = mainContainer.CreateChildContainer();

            unityContainer.RegisterType<Interface1, Class1>();
            unityContainer.RegisterType<Interface2, Class2>(new SingletonLifetimeManager());
            unityContainer.RegisterType<Interface3, Class3>();

            // resolve crashes with "Resolution failed with error: No public constructor is available for type UnitTests.Interface1."
            unityContainer.Resolve<Interface3>().Should().BeOfType<Class3>();
        }
    }
}

Everything runs fine when using a directly created container (see first test) and goes wrong when using a child container (second test). Is this the intended behaviour, maybe because of the singleton or is it a bug?

[ENikS]

The development and support for this project is on pause until financial situation is improved
unitycontainer/unity#368