Openapi-generator-maven-plugin not able to generate objects for multipart/form-data request

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

Models not generated for multipart/form-data request using openapi-generator-maven-plugin

openapi-generator version

openapi-generator 6x

OpenAPI declaration file content or url

Generation Details

Steps to reproduce

Related issues/PRs

Suggest a fix

Not a fix but has a workaroud. By default skipFormModel is true need to explicitly make it false
Tried out using a workaround from https://github.com/OpenAPITools/openapi-generator/issues/10415#issuecomment-1003067496 and it fixes the issue, but still, it is a workaround and not default behavior

Start at the openapi-generator-maven-plugin entry point and reproduce the multipart/form-data request with the reported workaround setting, skipFormModel=false. Compare the default behavior with the expected generated models and add coverage showing that models are generated without requiring this workaround.