[BUG][Java] Multipart request model not generated on Spring generatorName

Description

The code generated for a request body of type "multipart/form-data" that contains a reference to an object model as well as the file property(binary format) is missing the object model.

openapi-generator version

6.2.1 and I also try with 6.4.0, but the result is the same

OpenAPI declaration file content or url

openapi: 3.0.0
info:
  title: SEDJUDE Common
  description: API de conexión a peticiones comunes
  version: v1
servers:
  - url: http://localhost:8080
tags:
  - name: Download
    description: "Descarga de documentos"
paths:
  /ejemplo:
    post:
      summary: Ejemplo de petición multipart con objeto
      requestBody:
        required: true
        content:
          multipart/form-data: # Media type
            schema: # Request payload
              type: object
              properties: # Request parts
                id: # Part 1 (string value)
                  type: string
                  format: uuid
                address: # Part2 (object)
                  type: object
                  properties:
                    street:
                      type: string
                    city:
                      type: string
                profileImage: # Part 3 (an image)
                  type: string
                  format: binary
      responses:
        '200':
          description: Respuesta exitosa

Command line used for generation

<plugin>
                <groupId>org.openapitools</groupId>
                <artifactId>openapi-generator-maven-plugin</artifactId>
                <version>6.2.1</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                        <configuration>
                            <inputSpec>
                                ${project.basedir}/src/main/resources/open-api.yml
                            </inputSpec>
                            <generatorName>spring</generatorName>
                            <apiPackage>${project.groupId}.web.api</apiPackage>
                            <modelPackage>${project.groupId}.dto</modelPackage>
                            <supportingFilesToGenerate>ApiUtil.java</supportingFilesToGenerate>
                            <configOptions>
                                <useSpringBoot3>true</useSpringBoot3>
                                <useJakartaEe>true</useJakartaEe>
                                <useSwaggerUI>true</useSwaggerUI>
                                <delegatePattern>false</delegatePattern>
                                <additionalModelTypeAnnotations>
                                    @lombok.Data
                                    @lombok.Builder
                                    @lombok.AllArgsConstructor
                                    @lombok.NoArgsConstructor
                                    @com.fasterxml.jackson.annotation.JsonInclude(com.fasterxml.jackson.annotation.JsonInclude.Include.NON_NULL)
                                </additionalModelTypeAnnotations>
                                <useSpringController>true</useSpringController>
                                <interfaceOnly>true</interfaceOnly>
                                <useTags>true</useTags>
                                <skipIfSpecIsUnchanged>true</skipIfSpecIsUnchanged>
                            </configOptions>
                            <typeMappings>
                                <typeMapping>OffsetDateTime=java.time.LocalDateTime</typeMapping>
                            </typeMappings>
                            <importMappings>
                                <importMapping>java.time.OffsetDateTime=java.time.LocalDateTime</importMapping>
                            </importMappings>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

Steps to reproduce

1. Run mvn clean compile on a maven project that has the plugin mentioned above.
2. Observe that the not-generated-object related class is not generated and the compilation fails with the following errors:
   [ERROR] COMPILATION ERROR :
   [INFO] -------------------------------------------------------------
   [ERROR] /C:/Users/sasanchez/Proyectos/Justicia/pms/sedjude.back-common/target/generated-sources/openapi/src/main/java/mju/ntj/commom/web/api/DefaultApi.java:[8,26] cannot find symbol
   symbol: class EjemploPostRequestAddress
   location: package mju.ntj.commom.dto
   [ERROR] /C:/Users/sasanchez/Proyectos/Justicia/pms/sedjude.back-common/target/generated-sources/openapi/src/main/java/mju/ntj/commom/web/api/DefaultApi.java:[66,114] cannot find symbol
   symbol: class EjemploPostRequestAddress
   location: interface mju.ntj.commom.web.api.DefaultApi

Related issues/PRs

https://swagger.io/docs/specification/describing-request-body/multipart-requests/

Reproduce the issue with the supplied OpenAPI declaration and Maven configuration by running mvn clean compile. Start by inspecting the generated DefaultApi.java and the Spring generator's multipart request handling. Done means the referenced address model is generated under the configured DTO package and compilation succeeds without the missing EjemploPostRequestAddress errors.