NSwag: [Regression] Swagger.json not generated after upgrade to 13.11.x in docker container

Hitting localhost:5000 when running locally (tried in windows, linux and macos) produces the proper output, but if packed in a docker container, it hangs on getting the swagger.json file. The sample works OK if using nswag 13.10.9. Not working w/ any of the 13.11.x.

It appears the problem is related to using an external (from nuget) class for a property type of the generated model. In the example we use nswag class, but we observed it with our own external assemblies.

test.csproj:

<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>Net5.0</TargetFramework>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="NSwag.AspNetCore" Version="13.11.2" />
  </ItemGroup>
  <ItemGroup>
    <None Update="Dockerfile">
      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
    </None>
  </ItemGroup>
</Project>

Program.cs:

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace Test
{
    [ApiController]
    [Route("/")]
    public class Program
    {
        [NonAction]
        public static async System.Threading.Tasks.Task Main(string[] args) => 
            await Host.CreateDefaultBuilder(args)
            .ConfigureWebHostDefaults(a =>
            {
                a.UseStartup<Program>();
                a.UseUrls(string.Empty);
                a.UseKestrel(o => o.ListenAnyIP(5000));
            })
        .RunConsoleAsync();

        [NonAction]
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            app.UseRouting();
            app.UseOpenApi();
            app.UseSwaggerUi3();
            app.UseEndpoints(o => o.MapControllers());
        }

        [NonAction]
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers();
            services.AddOpenApiDocument();
            services.AddMvcCore();
        }

        [HttpGet("{id}")]
        public TestDetail Get()
        {
            return new TestDetail();
        }

        public sealed class TestDetail
        {
            /// <summary>
            /// NSwag 13.11.x fails to generate the swagger.json when a reference to a type in another assembly is present in the model.
            /// This only occurs when hosting in a linux docker container.
            /// No issues when running locally or in Windows docker container.
            /// </summary>
            public NSwag.OpenApiContact Test { get; set; }

        }
    }
}

Dockerfile:

FROM mcr.microsoft.com/dotnet/aspnet:5.0
EXPOSE 5000
COPY . .
ENTRYPOINT ["dotnet", "test.dll"]