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Error: Unexpected character '«' when generate client API using CSharpClientGenerator

See original GitHub issue

Project

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp3.1</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
    <PackageReference Include="NSwag.CodeGeneration.CSharp" Version="13.6.0" />
  </ItemGroup>

</Project>

Source

  public static class Program {
        private static async Task<OpenApiDocument> FromUrl() {
            const string url = "https://activiti.alfresco.com/activiti-app/api/v2/api-docs?group=enterprise";
            return await OpenApiDocument.FromUrlAsync(url).ConfigureAwait(false);
        }

        private static async Task<OpenApiDocument> FromFile() {
            const string input = "resource/api.json";
            var json = File.ReadAllText(input);
            return await OpenApiDocument.FromJsonAsync(json).ConfigureAwait(false);
        }

        public static async Task Main(string[] _) {
            const string output = "src/ProcessApi/ProcessClient.cs";

            // var single = new SingleClientFromPathSegmentsOperationNameGenerator();

            var settings = new CSharpClientGeneratorSettings {
                ClassName = "ProcessClient",
                ExposeJsonSerializerSettings = true,
                InjectHttpClient = true,
                // OperationNameGenerator = single,
                CSharpGeneratorSettings = {
                    Namespace = "ProcessApi",
                },
            };

            var document = await FromUrl();
            var generator = new CSharpClientGenerator(document, settings);
            var code = generator.GenerateFile();

            File.WriteAllText(output, code);
        }
    }