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swagger yaml - number property with default value generates optional/nullable double with broken assignment to just "D"

See original GitHub issue

NSwagStudio v13.6.0.0

The generated default value expression seems to just be missing the intended default and only includes the “D” suffix to flag the value as a double

    [System.CodeDom.Compiler.GeneratedCode("NJsonSchema", "10.1.18.0 (Newtonsoft.Json v12.0.0.0)")]
    public partial class SomeObject 
    {
        [Newtonsoft.Json.JsonProperty("someOptionalProperty", Required = Newtonsoft.Json.Required.Default, NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
        public double? SomeOptionalProperty { get; set; } = D;
    }

Minimal repro I could come up with has this swagger yaml:

swagger: '2.0'
definitions:
  SomeObject:
    type: object
    properties:
      someOptionalProperty:
        default: 123
        type: number

and this nswag.json (contains the above swagger yaml inline)

{
  "runtime": "NetCore31",
  "documentGenerator": {
    "fromDocument": {
      "json": "swagger: '2.0'\r\ndefinitions:\r\n  SomeObject:\r\n    type: object\r\n    properties:\r\n      someOptionalProperty:\r\n        default: 123\r\n        type: number\r\n"
    }
  },
  "codeGenerators": {
    "openApiToCSharpClient": {
      "generateDefaultValues": true
    }
  }
}