[BUG] [Java client] oneOf is not handling inheritance properly

If I'm using this component defintions:

    AccountReference:
      type: object
      properties:
        currency:
          type: string

    AccountReferenceIban:
      description: IBAN of an account
      allOf:
        - $ref: '#/components/schemas/AccountReference'
        - type: object
          properties:
            iban:
              type: string
          required:
            - iban

    AccountReferenceBban:
      description: Basic Bank Account Number (BBAN) Identifier
      allOf:
        - $ref: '#/components/schemas/AccountReference'
        - type: object
          properties:
            bban:
              type: string
          required:
            - bban

    SinglePayment:
      type: object
      properties:
        endToEndIdentification:
          type: string
        debtorAccount:
          oneOf:
            - $ref: "#/components/schemas/AccountReferenceIban"
            - $ref: "#/components/schemas/AccountReferenceBban"

I have multiple problems with the generated code:

AccountReferenceIban and AccountReferenceBban doesn't extend AccountReference.

public class AccountReferenceBban  {
  
  @ApiModelProperty(value = "")
  private String currency;
...

SinglePayment has a

private OneOfAccountReferenceIbanAccountReferenceBban debtorAccount = null;

that refers a non existing class.
Insted it should use the common parent AccountReference.

Start with the supplied OpenAPI schema and generate the Java client, then inspect the generated AccountReferenceIban, AccountReferenceBban, and SinglePayment classes. Compare their inheritance and debtorAccount type with the issue’s expected behavior; done means the child classes extend AccountReference and SinglePayment uses the common parent without a nonexistent OneOf class.