[BUG] [C#] Polymorphism with 2 level derived classes generates invalid client

Created by: scavarda

Generated client is invalid for this example: Using latest version 5.0.1

    public class BaseClass1
    {
        public int Number { get; set; }
    }

    public class DerivedClass_A : BaseClass1
    {
        public int Number2 { get; set; }
    }

    public class DerivedClass_B : DerivedClass_A
    {
        public int Number3 { get; set; }
    }

document

{
  "openapi": "3.0.1",
  "info": {
    "title": "Test",
    "description": "Test",
    "contact": {
      "name": "John Doe",
      "url": "https://mydomain.com",
      "email": "johndoe@hotmail.com"
    },
    "license": {
      "name": "-"
    },
    "version": "1.0.0.0"
  },
  "servers": [
    {
      "url": "http://127.0.0.1:5000"
    }
  ],
  "paths": {
    "/poly1": {
      "get": {
        "tags": [
          "Test"
        ],
        "operationId": "TestPolymorphism1",
        "responses": {
          "200": {
            "description": "Success",
            "content": {
              "application/json": {
                "schema": {
                  "oneOf": [
                    {
                      "$ref": "#/components/schemas/BaseClass1"
                    },
                    {
                      "$ref": "#/components/schemas/DerivedClass_A"
                    },
                    {
                      "$ref": "#/components/schemas/DerivedClass_B"
                    }
                  ]
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "BaseClass1": {
        "required": [
          "discriminator"
        ],
        "type": "object",
        "properties": {
          "discriminator": {
            "type": "string"
          },
          "number": {
            "type": "integer",
            "format": "int32"
          }
        },
        "additionalProperties": false,
        "discriminator": {
          "propertyName": "discriminator",
          "mapping": {
            "BaseClass1": "#/components/schemas/BaseClass1",
            "DerivedClass_A": "#/components/schemas/DerivedClass_A",
            "DerivedClass_B": "#/components/schemas/DerivedClass_B"
          }
        }
      },
      "DerivedClass_A": {
        "required": [
          "discriminator"
        ],
        "type": "object",
        "allOf": [
          {
            "$ref": "#/components/schemas/BaseClass1"
          }
        ],
        "properties": {
          "discriminator": {
            "type": "string"
          },
          "number2": {
            "type": "integer",
            "format": "int32"
          }
        },
        "additionalProperties": false,
        "discriminator": {
          "propertyName": "discriminator",
          "mapping": {
            "DerivedClass_A": "#/components/schemas/DerivedClass_A",
            "DerivedClass_B": "#/components/schemas/DerivedClass_B"
          }
        }
      },
      "DerivedClass_B": {
        "type": "object",
        "allOf": [
          {
            "$ref": "#/components/schemas/DerivedClass_A"
          }
        ],
        "properties": {
          "number3": {
            "type": "integer",
            "format": "int32"
          }
        },
        "additionalProperties": false
      }
    }
  }
}

The error is in the constructor of DerivedClass_A when calling base(....), discriminator is missing in the arguments