Example for OpenAPI generator bug report

spec.yaml

openapi: '3.0.3'
info:
  title: API Title
  version: '1.0'
servers:
  - url: https://api.server.test/v1
paths: {}
components:
  schemas:
    Test:
      type: object
      additionalProperties: false
      discriminator:
        propertyName: type
        mapping:
          A: "#/components/schemas/TestA"
          B: "#/components/schemas/TestB"
      anyOf:
        - $ref: "#/components/schemas/TestA"
        - $ref: "#/components/schemas/TestB"
      properties:
        type:
          enum:
            - A
            - B
          type: string
    TestA:
      additionalProperties: false
      type: object
      allOf:
        - $ref: "#/components/schemas/Test"
      properties:
        keyA:
          enum:
            - X
            - Y
          type: string
    TestB:
      additionalProperties: false
      type: object
      allOf:
        - $ref: "#/components/schemas/Test"
      properties:
        keyB:
          type: string