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I just had a similar problem and looked into the taggit tests. The only thing I got working is adding the tags after creation like so:
defaults = {
'owner': user,
'title': obj.title,
'abstract': obj.abstract,
'url': obj.url,
}
obj_instance, created = Obj.objects.get_or_create(title=obj.title, defaults=defaults)
obj_instance.add(*obj.keywords)
Source:stackexchange.com