[BUG] [typescript-fetch] Named array types don't correctly deserialise elements

Bug Report Checklist

Description

Generating typescript-fetch code for an item which is an named array type produces code which doesn't correctly deserialise elements

openapi-generator version

6.5.0

OpenAPI declaration file content or url

openapi: "3.0.2"
info:
  title: Test
  version: "1.0"
servers:
  - url: https://api.server.test/v1
paths:
  /test:
    get:
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/MyArray"

components:
  schemas:
    MyArray:
      type: array
      items:
        type: object
        properties:
          my_prop:
            type: string
        required:
          - my_prop

Generation Details

The code was generated with

npx @openapitools/openapi-generator-cli generate -i test.yml -g typescript-fetch --additional-properties=typescriptThreePlus=true --generate-alias-as-model -o test/

This generates MyArray.ts containing

export function MyArrayFromJSONTyped(json: any, ignoreDiscriminator: boolean): MyArray {
    return json;
}

export function MyArrayToJSON(value?: MyArray | null): any {
    return value;
}

The json is directly cast to MyArray rather than calling MyArrayInnerFromJSONTyped or MyArrayInnerToJSON.

Workaround

Changing the schema to

openapi: "3.0.2"
info:
  title: Test
  version: "1.0"
servers:
  - url: https://api.server.test/v1
paths:
  /test:
    get:
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                type: array
                items:
                  type: object
                  properties:
                    my_prop:
                      type: string
                  required:
                    - my_prop

Produces the working typescript

    async testGetRaw(initOverrides?: RequestInit | runtime.InitOverrideFunction): Promise<runtime.ApiResponse<Array<TestGet200ResponseInner>>> {
        const queryParameters: any = {};

        const headerParameters: runtime.HTTPHeaders = {};

        const response = await this.request({
            path: `/test`,
            method: 'GET',
            headers: headerParameters,
            query: queryParameters,
        }, initOverrides);

        return new runtime.JSONApiResponse(response, (jsonValue) => jsonValue.map(TestGet200ResponseInnerFromJSON));
    }

Reproduce the issue with the provided OpenAPI YAML and typescript-fetch generation command. Start by inspecting the generated MyArray.ts and compare its named-array serialization with the inline-array workaround shown in the report. Done means named array elements are deserialized and serialized through the generated inner conversion functions.