Missing schemas with polymorphic openapi

[sathish-soundarapandian]

Example openapi spec for reproducing the issue -

openapi: 3.0.3
info:Test API Reference
  version: '1.0'
  description: This is the Open Api Spec 3 for the TEST Service. This is under active development. Beware of the breaking change with respect to the generated code stub.
  contact:
    name: API Support
    email: contact@test.io
    url: 'https://test.io/'
servers:
  - url: 'https://app.test.io'
paths:
  '/v1/integrations/{integration}':
    post:
      summary: Create integration
      tags:
        - Integrations
      operationId: create-integration
      responses:
        '201':
          $ref: '#/components/responses/IntegrationResponse'
      x-stoplight:
        id: 7ky8v205wqtp4
      description: Create integration
      security:
        - x-api-key: []
      parameters:
        - $ref: '#/components/parameters/Integration'
        - $ref: '#/components/parameters/AccountHeader'
        - $ref: '#/components/parameters/DryRun'
        - $ref: '#/components/parameters/WriteValidation'
      requestBody:
        $ref: '#/components/requestBodies/IntegrationRequest'
      x-internal: false
components:
  schemas:
    AbstractIntegrationRequest:
      title: AbstractIntegrationRequest
      type: object
      description: Abstract for integration request
      properties:
        request:
          $ref: '#/components/schemas/BaseIntegrationRequest'
      required:
        - request
    BaseIntegrationRequest:
      title: BaseIntegrationRequest
      type: object
      description: Base integration request
      required:
        - type
      discriminator:
        propertyName: type
        mapping:
          git: '#/components/schemas/GitIntegrationRequest'
      properties:
        type:
          type: string
          enum:
            - git
    GitIntegrationRequest:
      title: GitIntegrationRequest
      x-discriminator-value: git
      description: Git Integration Request
      allOf:
        - $ref: '#/components/schemas/BaseIntegrationRequest'
        - type: object
          properties:
            type:
              type: string
              enum:
                - git
            connector_identifier:
              type: string
            read_validation_details:
              $ref: '#/components/schemas/ReadValidationDetails'
            write_validation_details:
              $ref: '#/components/schemas/WriteValidationDetails'
          required:
            - type
            - connector_identifier
    ReadValidationDetails:
      title: ReadValidationDetails
      type: object
      properties:
        file_url:
          type: string
    WriteValidationDetails:
      title: WriteValidationDetails
      type: object
      properties:
        repository:
          type: string
        branch:
          type: string
        path:
          type: string
    ValidationResponse:
      title: ValidationResponse
      type: object
      properties:
        url:
          type: string
        status:
          type: string
        error:
          type: string
        validated:
          type: integer
          format: int64
    AbstractIntegrationResponse:
      title: AbstractIntegrationResponse
      type: object
      properties:
        response:
          $ref: "#/components/schemas/BaseIntegrationResponse"
    BaseIntegrationResponse:
      title: BaseIntegrationResponse
      type: object
      description: Base integration response
      discriminator:
        propertyName: type
        mapping:
          git: '#/components/schemas/GitIntegrationResponse'
      properties:
        type:
          type: string
          enum:
            - git
    GitIntegrationResponse:
      x-discriminator-value: git
      allOf:
        - $ref: "#/components/schemas/BaseIntegrationResponse"
        - type: object
          properties:
            identifier:
              type: string
            name:
              type: string
            connector_identifier:
              type: string
            connector_type:
              type: string
            display_type:
              type: string
            host:
              type: string
            auth_type:
              type: string
            via_delegate:
              type: boolean
            validation:
              $ref: '#/components/schemas/ValidationResponse'
  parameters:
    AccountHeader:
      name: Harness-Account
      in: header
      required: false
      schema:
        type: string
      description: 'Identifier field of the account the resource is scoped to. This is required for Authorization methods other than the x-api-key header. If you are using the x-api-key header, this can be skipped.'
    Integration:
      name: integration
      in: path
      description: Integration
      required: true
      schema:
        type: string
        enum:
          - git
    DryRun:
      name: dry_run
      in: query
      required: false
      schema:
        type: boolean
      description: This is used if we need to dry run for integration
    WriteValidation:
      name: write_validation
      in: query
      required: false
      schema:
        type: boolean
      description: This is used if we need to dry run write permission for integration
  requestBodies:
    IntegrationRequest:
      required: true
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/AbstractIntegrationRequest'
          examples: { }
      description: Details of Integration Request
  responses:
    IntegrationResponse:
      description: Response for integration
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/AbstractIntegrationResponse'
        application/yaml:
          schema:
            $ref: '#/components/schemas/AbstractIntegrationResponse'
  securitySchemes:
    x-api-key:
      name: x-api-key
      type: apiKey
      in: header
tags:
  - name: Integrations
    description: Test Integrations
    x-displayName: Test Integrations

When we try to generate the client code, we have GitIntegrationResponse, ValidationResponse, GitIntegrationRequest, ReadValidationDetails, WriteValidationDetails schemas missing.