[Typescript-Angular] Wrong import generated with request having schema with oneOf

Description

The generated code for a path response having schema with oneOf generates a wrong file import

Swagger-codegen version

3.0.34, 3.0.35

Swagger declaration file content or url

openapi: 3.0.0
info: {
  title: 'abc',
  version: "1"
}
paths:
  /test:
    get:
      responses:
        default:
          description: 'abc'
          content:
            application/json:
              schema:
                items:
                  oneOf:
                    - $ref: '#/components/schemas/ClassA'
                    - $ref: '#/components/schemas/ClassB'
components:
  schemas:
    ClassA:
      type: object
    ClassB:
      type: object
      

Command line used for generation

java -jar swagger-codegen-cli-3.jar generate -i ${api.url} -l typescript-angular -o ./ --additional-properties ngVersion=13.3.0

Steps to reproduce

Generate the client using the typescript-angular generator, see that it imports { ClassAClassB } from '../model/classAClassB'; without actually generating that class.

Start with the typescript-angular generator and reproduce the issue using the OpenAPI YAML and the documented swagger-codegen CLI command. Inspect how the response schema containing oneOf is converted into imports and model names; done means the generated client imports only classes that are actually generated, including ClassA and ClassB.