[BUG] - [JAVA] - UNKNOWN_BASE_TYPE is not auto-generated from open-api spec yaml

Bug Report Checklist

• [x ] Have you provided a full/minimal spec to reproduce the issue?
• [x ] Have you validated the input using an OpenAPI validator (example)?
• [x ] Have you tested with the latest master to confirm the issue still exists?
• [x ] Have you searched for related issues/PRs?
• [x ] What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

While using version 5.4.0, for the schema attribute which is defined without type , it's generated as InlineObject, InlineObject1 is created,
We are upgrading to 6.0.0 version , where the inline object is not generated and recognized as Unknown_Base_Type.java
Could you please help us to config this.

Actual Code:

Expected Code:

openapi-generator version

6.6.0

OpenAPI declaration file content or url

      requestBody:
        description: Contract info parameters
        content:
          application/json:
            schema:
              type: object
              properties:
                requestInfo:
                  $ref: '#/components/schemas/BadPayerInfo' 
                referenceNumber:
                  type: string

Generation Details

Pom.xml used to generate code

Steps to reproduce

For the above yaml file mentioned, use the pom. xml to generate java code, InLineObject is not generated.

Suggest a fix

Please help us to fix this issue to replace the autogeneration of inLineObject.

Start with the supplied OpenAPI YAML and pom.xml generation configuration, then reproduce the Java output using OpenAPI Generator 6.6.0. Compare the generated Unknown_Base_Type.java result with the expected inline object behavior; done means the inline schema is generated and referenced correctly instead of producing Unknown_Base_Type.