oneOf doesn't seem to be working properly

[Robert-Stackflow]

Steps to reproduce

When an entity contains oneOf

I have found #5, but this issue seems to have not been resolved subsequently.My expectation is similar to #5 (comment).

Expected results

The fromJson function of InstructionUnion can automatically call the fromJson function of TimelineAddEntries and other classes according to the property type to construct.

Actual results

It only returns InstructionUnion()

Your OpenApi snippet

    InstructionUnion:
      discriminator:
        mapping":
          TimelineAddEntries: '#/components/schemas/TimelineAddEntries'
          TimelineAddToModule: '#/components/schemas/TimelineAddToModule'
          TimelineClearCache: '#/components/schemas/TimelineClearCache'
          TimelinePinEntry: '#/components/schemas/TimelinePinEntry'
          TimelineReplaceEntry: '#/components/schemas/TimelineReplaceEntry'
          TimelineShowAlert: '#/components/schemas/TimelineShowAlert'
          TimelineShowCover: '#/components/schemas/TimelineShowCover'
          TimelineTerminateTimeline: '#/components/schemas/TimelineTerminateTimeline'
        propertyName: type
      oneOf:
        - $ref: '#/components/schemas/TimelineAddEntries'
        - $ref: '#/components/schemas/TimelineAddToModule'
        - $ref: '#/components/schemas/TimelineClearCache'
        - $ref: '#/components/schemas/TimelinePinEntry'
        - $ref: '#/components/schemas/TimelineReplaceEntry'
        - $ref: '#/components/schemas/TimelineShowAlert'
        - $ref: '#/components/schemas/TimelineTerminateTimeline'
        - $ref: '#/components/schemas/TimelineShowCover'

Code sample

Code sample

abstract class InstructionUnion {
  String get type;
}

class TimelineAddEntries implements InstructionUnion {
  @override
  final String type = 'TimelineAddEntries';
  // other
}

class TimelineAddToModule implements InstructionUnion {
  @override
  final String type = 'TimelineAddToModule';
  // other
}

Logs

No response

Dart version and used packages versions

Dart version

3.5.0

Packages version

  freezed_annotation: ^2.4.4
  json_annotation: ^4.9.0
  retrofit: ^4.4.1

  json_serializable: ^6.7.1
  freezed: ^2.5.7
  swagger_parser: ^1.19.1
  retrofit_generator: ^9.1.2