KeyError: 'title' when using python 3.12 `type`

[v1ack]

No type case

InputModules = Module1 | Module2


class ResponseSchema(BaseModel):
  content: InputModules
  ...

Generated pydantic schema looks like

{
  'components': {
    'schemas': {
      'ResponseSchema': {
        'properties': {
          'content': {
            'anyOf': [
              {'$ref': '#/components/schemas/Module1'},
              {'$ref': '#/components/schemas/Module2'},
            ],
            'title': 'Content',
          },
        },
        'type': 'object',
        'required': ['content', ...],
        'title': 'ResponseSchema',
      },
    }
  }
}

type case

type InputModules = Module1 | Module2


class ResponseSchema(BaseModel):
  content: InputModules
  ...

Generated pydantic schema looks like

{
  'components': {
    'schemas': {
      'InputModules': {
        'anyOf': [
          {'$ref': '#/components/schemas/Module1'},
          {'$ref': '#/components/schemas/Module2'},
        ],
      },
      'ResponseSchema': {
        'properties': {
          'content': {'$ref': '#/components/schemas/InputModules'},
        },
        'type': 'object',
        'required': ['content', ...],
        'title': 'ResponseSchema',
      },
    }
  }
}

And app fails with exception

  File ".../fastapi/applications.py", line 1009, in openapi
    return JSONResponse(self.openapi())
                        ^^^^^^^^^^^^^^
  File ".../fastapi_jsonrpc/__init__.py", line 1436, in openapi
    self._restore_json_schema_fine_component_names(result)
  File ".../fastapi_jsonrpc/__init__.py", line 1425, in _restore_json_schema_fine_component_names
    fine_schema_name = key[:-len(schema['title'].replace('.', '__'))].replace('__', '.') + schema['title']
                                 ~~~~~~^^^^^^^^^
KeyError: 'title'

Environment:

fastapi~=0.116.1
pydantic~=2.11.7
fastapi-jsonrpc~=3.4.1