Django-grappelli: Autocomplete does not work with Django 3.2

VERSIONS:
Grappelli 2.15.1, Django 3.2
STATICFILES: WARNINGS,
Details:
I see a lot of errors with text like this

Found another file with the destination path 'admin/js/autocomplete.js'. It will be ignored since only the first encountered file is collected. If this is not what you want, make sure every static file has a unique path.

JAVASCRIPTS: ERROR
Failed to load resource: the server responded with a status of 403 (Forbidden)
CUSTOMIZATIONS: NONE

I upgraded django from 2.2 to 3.2 and it broke the autocomplete on related fields it just always says 403 and gives the following error:

Forbidden (Permission denied): /admin/autocomplete/
Traceback (most recent call last):
  File "/home/alex/Project/env/lib/python3.8/site-packages/django/utils/datastructures.py", line 76, in __getitem__
    list_ = super().__getitem__(key)
KeyError: 'app_label'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/alex/Project/env/lib/python3.8/site-packages/django/contrib/admin/views/autocomplete.py", line 61, in process_request
    app_label = request.GET['app_label']
  File "/home/alex/Project/env/lib/python3.8/site-packages/django/utils/datastructures.py", line 78, in __getitem__
    raise MultiValueDictKeyError(key)
django.utils.datastructures.MultiValueDictKeyError: 'app_label'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/alex/Project/env/lib/python3.8/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/home/alex/Project/env/lib/python3.8/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/alex/Project/env/lib/python3.8/site-packages/django/contrib/admin/sites.py", line 250, in wrapper
    return self.admin_view(view, cacheable)(*args, **kwargs)
  File "/home/alex/Project/env/lib/python3.8/site-packages/django/utils/decorators.py", line 130, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/home/alex/Project/env/lib/python3.8/site-packages/django/views/decorators/cache.py", line 44, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/home/alex/Project/env/lib/python3.8/site-packages/django/contrib/admin/sites.py", line 232, in inner
    return view(request, *args, **kwargs)
  File "/home/alex/Project/env/lib/python3.8/site-packages/django/contrib/admin/sites.py", line 417, in autocomplete_view
    return AutocompleteJsonView.as_view(admin_site=self)(request)
  File "/home/alex/Project/env/lib/python3.8/site-packages/django/views/generic/base.py", line 70, in view
    return self.dispatch(request, *args, **kwargs)
  File "/home/alex/Project/env/lib/python3.8/site-packages/django/views/generic/base.py", line 98, in dispatch
    return handler(request, *args, **kwargs)
  File "/home/alex/Project/env/lib/python3.8/site-packages/django/contrib/admin/views/autocomplete.py", line 20, in get
    self.term, self.model_admin, self.source_field, to_field_name = self.process_request(request)
  File "/home/alex/Project/env/lib/python3.8/site-packages/django/contrib/admin/views/autocomplete.py", line 65, in process_request
    raise PermissionDenied from e
django.core.exceptions.PermissionDenied
[02/May/2021 20:11:33] "GET /admin/autocomplete/ HTTP/1.1" 403 135

This ticket seems to be related to the issue
https://code.djangoproject.com/ticket/32659?cversion=2&cnum_hist=2

Downgrade to 3.1 fixes the issue.