I have this custom save() method in mt admin.py:

def save_model(self, request, obj, form, change):
    if obj._state.adding:
        obj.added_by = request.user
        return super().save_model(request, obj, form, change)

After a recent update this is not working any more; indeed, when I hit ‘save’ on the backend I get no errors and the data is not saved on the database.

It has worked until a recent update (I think up until 5.0.2).