Empty actor content type and actor object id fields in admin panel

[mrMarcosss]

I'm using UUID as a pk for my models and when I do

order = Order.objects.get(pk='bb79ca5c-9e98-4e20-a0d2-b610df04cca7')
user = request.user
notify.send(sender=order, recipient=user, verb='blabla', level='error', carge_id='some_id', public=False)

new Notification created successfully
but when I go to the admin panel to view current object
actor_content_type and actor_object_id fields are empty and I also can't update it through django panel because of This field is required. errors.

The same happens when I try to create Notification through admin. Object created but after redirect the fields became empty

however in DB those fields are populated, checked it via shell and pgAdmin.
Also when I go to /inbox/notifications/ I see that object properly.

For target and action_object fields everything is working properly. The fields are shown in admin

FYI for models with pk as an Integer everything also works good.

Can you help me guys with this?