[BUG] [scala-sttp][java-client]Models not generated properly with nested oneOf

[bgong-mdsol]

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

scala-sttp client generator doesn't generate the model properly if using Array which item type is a nested oneOf/anyOf schema, this nested oneOf schema wasn't generated.

openapi-generator version

The both version 5.2.0 and the latest master branch (5.3.x)

OpenAPI declaration file content

components:
    PlaceholderPeriod:
      properties:
        sub_periods:
          items:
            discriminator:
              propertyName: event
            oneOf:
            - $ref: '#/components/schemas/PlaceholderSubPeriod'
            - $ref: '#/components/schemas/SubPeriod'
          type: array
      type: object
    SubPeriod:
      properties:
        event:
          type: string
      type: object
    PlaceholderSubPeriod:
      properties:
        event:
          type: string
      type: object

Generation Details

Command line used for generation

openapi-generator-cli generate \
  -g scala-sttp \
  -i name_of_file.yaml \
  -p mainPackage=myPackage \
  -o myApi

Steps to reproduce

Generated class PlaceholderPeriod

case class PlaceholderPeriod(
  subPeriods: Option[Seq[OneOfPlaceholderSubPeriodSubPeriod]] = None
)

Compile Error: not found: type OneOfPlaceholderSubPeriodSubPeriod

Related issues/PRs

Suggest a fix

[bgong-mdsol]

Java-client generator has the same problem.