[BUG][CSHARP][RESTSHARP] Enum array inside multipart/form-data request bug

Description

I have this endpoint which requires the content type to be multipart/form-data because of a file upload.
One of the other properties in the body is of type enum array.
Currently this is being generated:

localVarRequestOptions.FormParameters.Add("EnumArrayItems", MyNamespace.Api.Client.ClientUtils.Serialize(enumArrayItems)); // form parameter

It should generate this instead:

foreach (var enumArrayItem in enumArrayItems)
{
    localVarRequestOptions.FormParameters.Add("EnumArrayItems", MyNamespace.Api.Client.ClientUtils.ParameterToString(enumArrayItem)); // form parameter
}

openapi-generator version

OpenAPI Generator 7.14.0

OpenAPI declaration file content or url

https://gist.github.com/kipusoep/5070a52cb53537f5713ee83a41b210c2

Generation Details

I am using the REST API Client Code Generator v1.29.0.0 Visual Studio plugin to generate the code.

Start with the linked OpenAPI declaration and trace how the C# RESTSharp client generates multipart/form-data entries into FormParameters. Compare the generated enum-array code with the requested per-item ParameterToString form, and consider the task done when generation produces one form parameter for each enum-array item.