public class TestClass
    {
        public IScheduler Scheduler { get; set; }
    }

    public interface IScheduler
    {
        Guid Id { get; set; }
    }
    
    public class SchedulerA : IScheduler
    {
        public Guid Id { get; set; } = Guid.NewGuid();
    }

var test = new TestClass();
test.Scheduler = new SchedulerA();

// All these throw
var result1 = MessagePackSerializer.Typeless.Serialize(test);
var result2 = MessagePackSerializer.Serialize(test, MessagePack.Resolvers.ContractlessStandardResolver.Options);
var result3 = MessagePackSerializer.Serialize(test, MessagePack.Resolvers.TypelessContractlessStandardResolver.Options);

// Also throws
var resolver = CompositeResolver.Create(ContractlessStandardResolver.Instance, StandardResolver.Instance);
var options = MessagePackSerializerOptions.Standard.WithResolver(resolver);
var result4 = MessagePackSerializer.Serialize(test, options);