[BUG][JAVA] $ref not working correctly

Created by: maxbec

Bug Report Checklist

Have you provided a full/minimal spec to reproduce the issue?
Have you validated the input using an OpenAPI validator (example)?
Have you tested with the latest master to confirm the issue still exists?
Have you searched for related issues/PRs?
What's the actual output vs expected output?
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Description

We have the following swagger folder structure in our project:

- api
    - endpoints
    - schemas
    - common-elements (git submodule)
       - default-endpoints
          - Healthcheck.yml
       - default-schemas
          DefaultHeaders.yml
          Error.yml
- main_api.yml

Now in the Healthcheck file we have the following code which is referencing stuff in the common-elements git submodule:

500:
  description: Error on TCS side
  headers:
    cobaActivityID:
      $ref: "../common-elements/headers/DefaultHeaders.yaml#/Response/cobaActivityID"
    cobaMachineName:
      $ref: "../common-elements/headers/DefaultHeaders.yaml#/Response/cobaMachineName"
  content:
    application/json;charset=utf-8:
      schema:
        $ref: "../common-elements/schemas/Error.yaml#/Error"

With this setup we get the following error on generation and even on the teamcity build it is not working.

[WARNING] Exception while resolving:
java.lang.RuntimeException: Unable to load RELATIVE ref: ./common-elements/default-endpoints/common-elements/default-schemas/Error.yaml path: C:\dev\bitbucket\test\api

When we change $ref: "../common-elements/schemas/Error.yaml#/Error" for $ref: "./schemas/Error.yaml#/Error" it is working. But we only need to change it for the schema.

I need your help now. What is wrong here and what would be the correct referencing of the files?

openapi-generator version

5.3.0

Generation Details

mvn clean generate-sources

Steps to reproduce

See above