Error: Unexpected queryset model

[tofbang]

Hi,
i am on Debian 10 buster, python 3.7
I installed django-shop 1.2.4 demo and it works quite well.
however a bug related to the elasticsearch_dsl library occurs when I use the site search module:

TypeError at /en/search/
Unexpected queryset model (should be: <class 'myshop.models.Product'>, got: <class 'myshop.models.Product'>)

Request Method: GET
Request URL: http://www.cris-shiatsu.fr:9009/en/search/?q=test
Django Version: 3.0.14
Exception Tyoe: TypeError
Exception Value: Unexpected queryset model (should be: <class 'myshop.models.Product'>, got: <class 'myshop.models.Product'>)
Exception Location: /usr/local/lib/python3.7/site-packages/django_elasticsearch_dsl/search.py in filter_queryset, line 26
/usr/local/bin/uwsgi
Python version: 3.7.17

This bug refers to the following code in search.py ​​of the django-elasticsearch-dsl library:

def filter_queryset(self, queryset, keep_search_order=True):
"""
Filter an existing django queryset using the elasticsearch result.
It costs a query to the sql db.
"""
s = self
if s._model is not queryset.model:
raise TypeError(
'Unexpected queryset model '
'(should be: %s, got: %s)' % (s._model, queryset.model)
)

For the moment I commented out the error throwing condition and it works but i would like to understand and eventually resolve the problem without hacking the library

Please would you have an idea ?