django-activity-stream: Missing target while using actor_stream

hi. I’m expecting troubles with actor_stream(request.user).

for example:

from actstream.models import actor_stream, Action
print actor_stream(request.user)[0].target # returns None
print Action.objects.all()[0].target # returns Target object

BUT:

from actstream.models import actor_stream, Action
print request.user.actor_actions.all()[0].target  # returns Target object

User model - this is a custom user model, configured as described in djangoproject tutorial. Target model looks like this:

class Task(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    user = models.ForeignKey('core_auth.User', blank=True, null=True)
    ... < more fields >

Let me show you:

>>> from actstream.models import actor_stream, Action
>>> from core_auth.models import User
>>> u = User.objects.get(username='fynjah')
>>> actor_stream(u)[0].target # None
>>> x = actor_stream(u)[0]
>>> x
<Action: fynjah changed status DONE 58 minutes ago>
# BUT:
>>> x.target_content_type
<ContentType: Task>
>>> x.target
>>> x.target_object_id
u'f08ae5ab-8c07-4929-9021-62c867f0d081'
# AND:
>>> u.actor_actions.all()[0].target
<Task: wdstrm compositing>

What am i doing wrong :\