Code generator - enums are discarded

I've only just begun using Swagger-editor, so maybe I'm doing something wrong.

Using this simple description

openapi: 3.0.0
info:
  version: 0.0.1
  title: Test enums
paths:
  /products:
    get:
      summary: List all products
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Product'

components:
  schemas:
    Management:
      type: array
      items:
        type: string
        enum:
          - Active
          - Passive
    Product:
      type: object
      properties:
        id:
          type: string
        name:
          type: string
        management:
          $ref: '#/components/schemas/Management'
      required:
        - id
        - name
        - management

What I get:
Scala:

case class Management (
)

What I expect:
Scala:

sealed trait Management
    case object Active extends Management
    case object Passive extends Management

I use Scala here because it's less verbose. But it seem to be the same for Java, C# and likely others.

Start by reproducing the issue with the supplied OpenAPI definition and compare the generated Scala output with the expected enum representation. Then trace the relevant language generator templates or entry points for Scala, Java, and C#; done means array-based enum schemas are preserved rather than emitted as empty classes across the affected generators.