[BUG] Wrong DataType

The below code produces models with properties of data type List when the type should be List of type ClanWarAttack

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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OpenAPI declaration file content or url

openapi: 3.0.1
info:
  title: Clash of Clans API
  termsOfService: http://supercell.com/en/terms-of-service/
  version: v1
paths: {}
components:
  schemas:
    ClanWarMember:
      type: object
      properties:
        attacks:
          nullable: true
          allOf:
          - $ref: '#/components/schemas/ClanWarAttackList'
    ClanWarAttackList:
      type: array
      items:
        $ref: '#/components/schemas/ClanWarAttack'
    ClanWarAttack:
      type: object
      properties:
        order:
          type: integer