[BUG] isNullable set for object properties

[allComputableThings]

I'm doing some work on the Dart generator. I'm trying to add polymorphism to it (I already have a lot of code using the output of this generator), but I am running into another issue with nullable.

components:
   schemas:

    UserProfile:
      properties:
        family_name:
          default: null
          nullable: true
          type: string
        given_name:
          default: null
          nullable: true
          type: string
        locale:
          default: null
          nullable: true
          type: string
        profile_image:
          $ref: '#/components/schemas/Image'
          default: null         
          nullable: true         #   isNullable                <<<<<
        roles:
          items:
            enum:
            - child
            - teacher
            - student
            - admin
            - parent
            type: string
          nullable: true
          type: array
        source:
          default: null
          enum:
          - facebook
          - apple
          - user
          - google
          nullable: true
          type: string
        user_id:
          default: null
          nullable: true
          type: string
        user_profile_id:
          default: null
          nullable: true
          type: string
      type: object

Debugging what is parsed...

public class DartClientCodegen extends AbstractDartCodegen {
...
    @Override
    public ModelsMap postProcessModels(ModelsMap objs) {
        for (ModelMap mo :  objs.getModels()) {
            CodegenModel cm = mo.getModel();

            // Debug info - identify the models we're processing
            System.out.println("[1]Processing model: " + cm.name);

            if ("UserProfile".equals(cm.name)) {
                System.out.println("\n[1]FOUND UserProfile model - examining properties");
                // Directly examine the model's vars
                for (CodegenProperty prop : cm.vars) {
                    if ("profileImage".equals(prop.name)) {
                        System.out.println("[1]FOUND profileImage property in UserProfile:");
                        System.out.println("  - Property name: " + prop.name);
                        System.out.println("  - DataType: " + prop.dataType);
                        System.out.println("  - ComplexType: " + prop.complexType);
                        System.out.println("  - IsNullable: " + prop.isNullable);
                        System.out.println("  - IsModel: " + prop.isModel);
                    }
                }
            }
        }

I get ....

% java -jar ../../openapi-generator/modules/openapi-generator-cli/target/openapi-generator-cli.jar generate -i swagger.yaml -g dart -o ./_swagger --additional-properties=pubLibrary=flutter_common_openapi,pubName=flutter_common_openapi --openapi-normalizer REF_AS_PARENT_IN_ALLOF=true,REMOVE_ANYOF_ONEOF_AND_KEEP_PROPERTIES_ONLY=true,DISABLE_ALL=false)

[1]Processing model: UserProfile

[1]FOUND UserProfile model - examining properties
[1]FOUND profileImage property in UserProfile:
  - Property name: profileImage
  - DataType: Image
  - ComplexType: Image
  - IsNullable: false                     << ????? not isNullable
  - IsModel: true
Processing model: UserProfile

Also tried removing profile_image.default and adding required: []. Results seemed the same.

The nullable fields that are basic types seem correctly parsed and have isNullable set.

[allComputableThings]

Nothingburger. Seems caused by other local changes.