'allOf' not processed correctly for property

[devdevx]

Example with one schema property:

openapi: "3.0.0"
info:
  title: API-Template
  description: |
    Single or multilined API description. Can be written on HTML or [CommonMark](http://commonmark.org/help/)
  version: v1

tags:
  - name: Customers
    description: "Operations and resources related to customers"

paths:
  /customers/{customerId}:
    parameters:
      - $ref: '#/components/parameters/customerIdPathParam'
    get:
      summary: Retrieve customer information
      description: Description for operation that allows retrieve customer information
      operationId: retrieveCustomerInfo
      tags:
        - Customers
      responses:
        '200':
          description: Customer response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/customer'

components:
  parameters:
    customerIdPathParam:
      name: customerId
      in: path
      required: true
      description: The id of the customer
      schema:
        $ref: '#/components/schemas/uuid'

  schemas:
    uuid:
      type: string
      format: uuid
      minLength: 36
      maxLength: 36
      pattern: '[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}'

    customer:
      type: object
      properties:
        id:
          description: The id of the customer
          allOf:
           - $ref: '#/components/schemas/uuid'
          x-apigen-mapping:
            field: id

Code executed:

import io.swagger.v3.core.util.Yaml;
import io.swagger.v3.oas.models.OpenAPI;
import io.swagger.v3.parser.OpenAPIV3Parser;
import io.swagger.v3.parser.core.models.ParseOptions;
import org.apache.commons.io.IOUtils;

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;

public class Main {
    public static void main(String[] args) throws IOException {
        String api;
        try (InputStream is = Main.class.getClassLoader().getResourceAsStream("template_error.yaml")) {
            api = IOUtils.toString(is, StandardCharsets.UTF_8);
        }
        OpenAPIV3Parser parser = new OpenAPIV3Parser();
        ParseOptions options = new ParseOptions();
        options.setResolve(true);
        options.setResolveCombinators(true);
        options.setResolveFully(true);
        options.setFlatten(true);
        OpenAPI openAPI = parser.readContents(api, null, options).getOpenAPI();
        System.out.println(Yaml.mapper().writeValueAsString(openAPI));
    }
}

Output:

openapi: 3.0.0
info:
  title: API-Template
  description: |
    Single or multilined API description. Can be written on HTML or [CommonMark](http://commonmark.org/help/)
  version: v1
servers:
  - url: /
tags:
  - name: Customers
    description: Operations and resources related to customers
paths:
  /customers/{customerId}:
    get:
      tags:
        - Customers
      summary: Retrieve customer information
      description: Description for operation that allows retrieve customer information
      operationId: retrieveCustomerInfo
      parameters:
        - name: customerId
          in: path
          description: The id of the customer
          required: true
          style: simple
          explode: false
          schema:
            maxLength: 36
            minLength: 36
            pattern: "[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}"
            type: string
            format: uuid
      responses:
        "200":
          description: Customer response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/inline_response_200'
components:
  schemas:
    uuid:
      maxLength: 36
      minLength: 36
      pattern: "[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}"
      type: string
      format: uuid
    customer:
      type: object
      properties:
        id: {}
    inline_response_200:
      type: object
      properties:
        id: {}
  parameters:
    customerIdPathParam:
      name: customerId
      in: path
      description: The id of the customer
      required: true
      style: simple
      explode: false
      schema:
        maxLength: 36
        minLength: 36
        pattern: "[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}"
        type: string
        format: uuid

Expected result:

The id property in the customer and inline_response_200 schemas should have content and not be an empty object.

Tried with versions 2.0.33 and 2.1.1 with same result.

    <dependencies>
        <dependency>
            <groupId>io.swagger.parser.v3</groupId>
            <artifactId>swagger-parser</artifactId>
            <!-- <version>2.0.33</version>-->
            <version>2.1.1</version>
        </dependency>
    </dependencies>

Seems a similar issue to #1367 but that was closed.

Thanks!