[BUG][JAVA] RequestBody multiple contents not working, only takes first one into consideration

Description

Hello guys.

I have this schema example:

post:
      operationId: operation_1
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/RequestJson'
          multipart/form-data:
            schema:
              $ref: '#/components/schemas/Request'
          application/x-www-form-urlencoded:
            schema:
              $ref: '#/components/schemas/Request'

Which is valid and generated the correct UI on Swagger UI as seen below

The generated client should have 2 methods, one for application/json content-type that accepts RequestJson body, and another one for application/x-www-form-urlencoded and multipart/form-data content-types that accepts Request body.

This does not occur and instead we only have one method that accepts RequestJson body, even in model folder, there is no Request file, which means that it is only being taken into consideration the RequestJson Model.

Thank you

Reproduce the issue with the OpenAPI requestBody schema shown in the report and inspect the Java client generation entry point that processes multiple content types. Verify how application/json, multipart/form-data, and application/x-www-form-urlencoded are handled. Done means separate generated methods use RequestJson and Request, and both models are present.