"Scope has changed": 'Request' object has no attribute 'GET'

[frafra]

Traceback (most recent call last):
  File "/usr/lib/ckan/venv/lib/python3.8/site-packages/ckanext/oauth2/views.py", line 58, in callback
    token = oauth2helper.get_token()
  File "/usr/lib/ckan/venv/lib/python3.8/site-packages/ckanext/oauth2/oauth2.py", line 117, in get_token
    token = oauth.fetch_token(self.token_endpoint,
  File "/usr/lib/ckan/venv/lib/python3.8/site-packages/requests_oauthlib/oauth2_session.py", line 244, in fetch_token
    self._client.parse_request_body_response(r.text, scope=self.scope)
  File "/usr/lib/ckan/venv/lib/python3.8/site-packages/oauthlib/oauth2/rfc6749/clients/base.py", line 448, in parse_request_body_response
    self.token = parse_token_response(body, scope=scope)
  File "/usr/lib/ckan/venv/lib/python3.8/site-packages/oauthlib/oauth2/rfc6749/parameters.py", line 441, in parse_token_response
    validate_token_parameters(params)
  File "/usr/lib/ckan/venv/lib/python3.8/site-packages/oauthlib/oauth2/rfc6749/parameters.py", line 471, in validate_token_parameters
    raise w
Warning: Scope has changed from "email profile openid" to "https://www.googleapis.com/auth/userinfo.profile openid https://www.googleapis.com/auth/userinfo.email".

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/ckan/venv/lib/python3.8/site-packages/flask/app.py", line 1949, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/lib/ckan/venv/lib/python3.8/site-packages/flask/app.py", line 1935, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/usr/lib/ckan/venv/lib/python3.8/site-packages/ckanext/oauth2/views.py", line 71, in callback
    error_description = toolkit.request.GET.get('error_description')
  File "/usr/lib/ckan/venv/lib/python3.8/site-packages/werkzeug/local.py", line 347, in __getattr__
    return getattr(self._get_current_object(), name)
  File "/usr/lib/ckan/venv/lib/python3.8/site-packages/werkzeug/local.py", line 347, in __getattr__
    return getattr(self._get_current_object(), name)
AttributeError: 'Request' object has no attribute 'GET'

[frafra]

I am testing the new Python 3/CKAN 2.9 branch, so the problem could be related to that.