[BUG] java: Map<String, Object>, to openapi spec: "additionalProperties": { "type": "object" }, after generated python client, most of the types can't handle

Description

in java:
class Tag{
Map<String, Object> attributes;
}
to openapi spec:
{"attributes": { "type": "object",
"additionalProperties": {
"type": "object"
} }
after generated python client, most of the types can't handle

openapi-generator version

6.6.0

OpenAPI declaration file content or url

{
  "openapi": "3.0.1",
  "info": {
    "title": "OpenAPI definition",
    "version": "v0"
  },
  "servers": [
    {
      "url": "http://localhost:8059",
      "description": "Generated server url"
    }
  ],
  "paths": {},
  "components": {
    "schemas": {
      "Tag": {
        "type": "object",
        "properties": {
          "attributes": {
            "type": "object",
            "additionalProperties": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Generation Details

java -jar ./openapi-generator-cli.jar generate -i ./nrpservice/nrp/lop/bcommon/openapi.json -g python-nextgen -o ./nrpservice/nrp/pylop1

openapi.json is exactly the content i have pasted above.

Steps to reproduce

import unittest

from openapi_client.models.tag import Tag

class MyTestCase(unittest.TestCase):
def test_tag(self):
tag = Tag();
print(Tag.to_json(tag))
json = '{"attributes":{"height":1}}'
tag1 = Tag.from_json(json)
print("data_class_instance=", tag1)

if name == "main":
unittest.main()

above case will fail by reporting:
File "pydantic/main.py", line 526, in pydantic.main.BaseModel.parse_obj
File "pydantic/main.py", line 341, in pydantic.main.BaseModel.init
pydantic.error_wrappers.ValidationError: 1 validation error for Tag
attributes -> height
value is not a valid dict (type=type_error.dict)

Start with the provided openapi.json and the python-nextgen generation command, then inspect the generated openapi_client/models/tag.py handling of attributes. Reproduce the failure with Tag.from_json('{"attributes":{"height":1}}'); done means the generated client accepts the demonstrated map value without the reported validation error.