allOf in schema property results in generation of invalid Java methods "putXXXItem"

Created by: hoodihub

Disclaimer: I face these issues when generating a Java SDK, I don't know whether it affects other languages too.

Problem: I'm currently using version 5.3.0 of the generator, and with this version it generates some invalid methods for a schema's class, if the schema contains a property with an allOf element.

yaml:

 MyType:
      required:
      - category
      type: object
      properties:
        category:
          type: object
          description: |-
            <strong>Type:</strong> Category<br/>
            The category
          allOf:
          - $ref: '#/components/schemas/Category'

The generated java class for MyType contains this method which doesn't compile:

  public MyType putCategoryItem(String key,  categoryItem) {
    this.category.put(key, categoryItem);
    return this;
  }

First of all, you can see that there's no type declaration for the "categoryItem" parameter. Also, "this.category" is not a map, but a reference to the Category class (which is correct).

This whole method doesn't make sense to me. The previous version of the generator that I used was version 5.0.1, and that version didn't contain these invalid "putXXXItem" methods.

Can you explain where this comes from, and how I would have to change my yaml file so that those methods are no longer created?