NewtonSoft.Json.Required.DisallowNull set on non required DTO properties

I have a schema that contains a MasterData like this:

            "MasterDataDto": {
                "required": ["companyId", "deleted", "masterDataTypeName", "message", "publicId", "synchronizedVersion", "version"],
                "type": "object",
                "properties": {
                    "masterDataTypeName": {
                        "type": "string"
                    },
                    "publicId": {
                        "type": "string"
                    },
                    "companyId": {
                        "type": "integer",
                        "format": "int64"
                    },
                    "version": {
                        "type": "integer",
                        "format": "int64"
                    },
                    "synchronizedVersion": {
                        "type": "integer",
                        "format": "int64"
                    },
                    "correlationId": {
                        "type": "string"
                    },
                    "deleted": {
                        "type": "boolean"
                    },
                    "message": {
                        "type": "string"
                    },
                    "createdDate": {
                        "type": "string",
                        "format": "date-time"
                    },
                    "updatedDate": {
                        "type": "string",
                        "format": "date-time"
                    },
                    "lastOperationId": {
                        "type": "string"
                    }
                }
            },

Only the properties mentioned in the "required" property are required.

But in the Dto class generated, all properties are generated with the NewtonSoft.Json.Required.DisallowNull value for the JsonProperty.Required property in the JsonProperty attribute:

    [System.CodeDom.Compiler.GeneratedCode("NJsonSchema", "13.20.0.0 (NJsonSchema v10.9.0.0 (Newtonsoft.Json v13.0.0.0))")]
    public partial class MasterDataDto
    {
        [Newtonsoft.Json.JsonProperty("masterDataTypeName", Required = Newtonsoft.Json.Required.DisallowNull, NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
        [System.ComponentModel.DataAnnotations.Required(AllowEmptyStrings = true)]
        public string MasterDataTypeName { get; set; }

        [Newtonsoft.Json.JsonProperty("publicId", Required = Newtonsoft.Json.Required.DisallowNull, NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
        [System.ComponentModel.DataAnnotations.Required(AllowEmptyStrings = true)]
        public string PublicId { get; set; }

        [Newtonsoft.Json.JsonProperty("companyId", Required = Newtonsoft.Json.Required.DisallowNull, NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
        public long CompanyId { get; set; }

        [Newtonsoft.Json.JsonProperty("version", Required = Newtonsoft.Json.Required.DisallowNull, NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
        public long Version { get; set; }

        [Newtonsoft.Json.JsonProperty("synchronizedVersion", Required = Newtonsoft.Json.Required.DisallowNull, NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
        public long SynchronizedVersion { get; set; }

        [Newtonsoft.Json.JsonProperty("correlationId", Required = Newtonsoft.Json.Required.DisallowNull, NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
        public string CorrelationId { get; set; }

        [Newtonsoft.Json.JsonProperty("deleted", Required = Newtonsoft.Json.Required.DisallowNull, NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
        public bool Deleted { get; set; }

        [Newtonsoft.Json.JsonProperty("message", Required = Newtonsoft.Json.Required.DisallowNull, NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
        [System.ComponentModel.DataAnnotations.Required(AllowEmptyStrings = true)]
        public string Message { get; set; }

        [Newtonsoft.Json.JsonProperty("createdDate", Required = Newtonsoft.Json.Required.DisallowNull, NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
        public System.DateTimeOffset? CreatedDate { get; set; }

        [Newtonsoft.Json.JsonProperty("updatedDate", Required = Newtonsoft.Json.Required.DisallowNull, NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
        public System.DateTimeOffset? UpdatedDate { get; set; }

        [Newtonsoft.Json.JsonProperty("lastOperationId", Required = Newtonsoft.Json.Required.DisallowNull, NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore)]
        public string LastOperationId { get; set; }

        private System.Collections.Generic.IDictionary<string, object> _additionalProperties;

        [Newtonsoft.Json.JsonExtensionData]
        public System.Collections.Generic.IDictionary<string, object> AdditionalProperties
        {
            get { return _additionalProperties ?? (_additionalProperties = new System.Collections.Generic.Dictionary<string, object>()); }
            set { _additionalProperties = value; }
        }

    }

What do I need to set to get the generator to respect the "required" property list? My code generators settings are:

  "codeGenerators": {
    "openApiToCSharpClient": {
      "clientBaseClass": null,
      "configurationClass": null,
      "generateClientClasses": true,
      "generateClientInterfaces": true,
      "clientBaseInterface": null,
      "injectHttpClient": true,
      "disposeHttpClient": true,
      "protectedMethods": [],
      "generateExceptionClasses": true,
      "exceptionClass": "MdmRestApiException",
      "wrapDtoExceptions": true,
      "useHttpClientCreationMethod": false,
      "httpClientType": "System.Net.Http.HttpClient",
      "useHttpRequestMessageCreationMethod": false,
      "useBaseUrl": true,
      "generateBaseUrlProperty": true,
      "generateSyncMethods": false,
      "generatePrepareRequestAndProcessResponseAsAsyncMethods": false,
      "exposeJsonSerializerSettings": true,
      "clientClassAccessModifier": "public",
      "typeAccessModifier": "public",
      "generateContractsOutput": true,
      "contractsNamespace": "Visma.Business.MdmRestClient",
      "contractsOutputFilePath": "IMdmRestApi.cs",
      "parameterDateTimeFormat": "s",
      "parameterDateFormat": "yyyy-MM-dd",
      "generateUpdateJsonSerializerSettingsMethod": true,
      "useRequestAndResponseSerializationSettings": false,
      "serializeTypeInformation": false,
      "queryNullValue": "",
      "className": "{controller}MdmRestApiClient",
      "operationGenerationMode": "SingleClientFromOperationId",
      "additionalNamespaceUsages": [],
      "additionalContractNamespaceUsages": [],
      "generateOptionalParameters": false,
      "generateJsonMethods": false,
      "enforceFlagEnums": false,
      "parameterArrayType": "System.Collections.Generic.IEnumerable",
      "parameterDictionaryType": "System.Collections.Generic.IDictionary",
      "responseArrayType": "System.Collections.Generic.ICollection",
      "responseDictionaryType": "System.Collections.Generic.IDictionary",
      "wrapResponses": false,
      "wrapResponseMethods": [],
      "generateResponseClasses": true,
      "responseClass": "SwaggerResponse",
      "namespace": "Visma.Business.MdmRestClient",
      "requiredPropertiesMustBeDefined": false,
      "dateType": "System.DateTimeOffset",
      "jsonConverters": null,
      "anyType": "object",
      "dateTimeType": "System.DateTimeOffset",
      "timeType": "System.TimeSpan",
      "timeSpanType": "System.TimeSpan",
      "arrayType": "System.Collections.Generic.ICollection",
      "arrayInstanceType": "System.Collections.ObjectModel.Collection",
      "dictionaryType": "System.Collections.Generic.IDictionary",
      "dictionaryInstanceType": "System.Collections.Generic.Dictionary",
      "arrayBaseType": "System.Collections.ObjectModel.Collection",
      "dictionaryBaseType": "System.Collections.Generic.Dictionary",
      "classStyle": "Poco",
      "jsonLibrary": "NewtonsoftJson",
      "generateDefaultValues": true,
      "generateDataAnnotations": true,
      "excludedTypeNames": [],
      "excludedParameterNames": [],
      "handleReferences": false,
      "generateImmutableArrayProperties": false,
      "generateImmutableDictionaryProperties": false,
      "jsonSerializerSettingsTransformationMethod": null,
      "inlineNamedArrays": false,
      "inlineNamedDictionaries": false,
      "inlineNamedTuples": true,
      "inlineNamedAny": false,
      "generateDtoTypes": true,
      "generateOptionalPropertiesAsNullable": true,
      "generateNullableReferenceTypes": false,
      "templateDirectory": null,
      "typeNameGeneratorType": null,
      "propertyNameGeneratorType": null,
      "enumNameGeneratorType": null,
      "serviceHost": null,
      "serviceSchemes": null,
      "output": "MdmRestApi.cs",
      "newLineBehavior": "Auto"
    }
  }

RicoSuter / NSwag

NewtonSoft.Json.Required.DisallowNull set on non required DTO properties #4531