Java enums are not generated correctly with anyOf

Created by: srividhyak27

Using openapi-generator-maven-plugin 3.1.2

EventType:
  anyOf:
  - type: string
    enum:
      - "A"
      - "B"
      - "C"
      - "D"
  - type: string

Enum is generated as a class EventType and contains only the basic equals, toString and hashCode methods. The values not not available in the class.