Csharp Client not generating valid enums

Description

CSharp client generation does not generate valid c# for enums with int values. eg
enum Sex {
None=0,
Male=1,
Female=2
}

After running generate command with the below config

{ "packageName":"{ProjectName}"}

The resultant code:
[JsonConverter(typeof(StringEnumConverter))]
public enum Sex
{

    /// <summary>
    /// Enum NUMBER_0 for 0
    /// </summary>
    [EnumMember(Value = 0)]
    NUMBER_0,
    
    /// <summary>
    /// Enum NUMBER_1 for 1
    /// </summary>
    [EnumMember(Value = 1)]
    NUMBER_1,
    
    /// <summary>
    /// Enum NUMBER_2 for 2
    /// </summary>
    [EnumMember(Value = 2)]
    NUMBER_2,
    
    /// <summary>
    /// Enum NUMBER_3 for 3
    /// </summary>
    [EnumMember(Value = 3)]
    NUMBER_3
}

Swagger-codegen version

2.2.3

Swagger declaration file content or url

Command line used for generation

java -jar swagger-codegen-cli.jar generate -i %JSON_CONFIG% -l csharp -c "%APP_FOLDER%code-gen-config.json" -o "%APP_FOLDER%API"

Steps to reproduce

Related issues

Suggest a Fix

Start with the reported java -jar swagger-codegen-cli.jar generate command and its C# output; the issue does not name a source file or test. Check how the integer-valued enum input is represented and compare it with the generated enum. Done means the generated C# is valid for that case; the thread has had no comment for years.