XmlElement is ignored for collections

[Dialecticus]

According to this Microsoft page when XmlElement attribute is applied to a collection property the result should be a "flat" sequence. Take this code:

using SoapCore;
using System.Collections.ObjectModel;
using System.ServiceModel;
using System.Xml.Serialization;

internal class Program
{
    private static void Main(string[] args)
    {
        var builder = WebApplication.CreateBuilder(args);

        builder.Services.AddControllers().AddXmlSerializerFormatters();
        builder.Services.AddSoapCore();
        builder.Services.AddScoped<ITesting, Testing>();

        var app = builder.Build();

        app.UseHttpsRedirection();
        app.UseRouting();
        app.UseAuthorization();
        app.UseEndpoints(endpoints => { endpoints.UseSoapEndpoint<ITesting>("/Testing", new SoapEncoderOptions(), SoapSerializer.XmlSerializer); });
        app.MapControllers();
        app.Run();
    }
}
public class Testing : ITesting
{
    private IWebHostEnvironment Environment;

    public Testing(IWebHostEnvironment _environment)
    {
        Environment = _environment;
    }

    public void Test(ExampleClass someObj)
    {
        throw new NotImplementedException();
    }
}

[ServiceContract(Namespace = "http://example.org/")]
public interface ITesting
{
    [OperationContract]
    public void Test(ExampleClass someObj);
}
[Serializable]
public class ExampleClass
{
    [XmlElement]
    public Collection<string> ExampleProp { get; set; }
}

In WSDL I should see a simple sequence <xs:element minOccurs="0" maxOccurs="unbounded" name="ExampleProp" type="xsd:string" />, but I see ArrayOfString construct instead.

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