CustomManager does not work with relations

I have User model with some CustomManager with some CustomQuerySet

class User(Model):
    objects = CustomManager(qs_cls=CustomQuerySet)
    ...

And Article with User as an author

class Article(Model):
    author = fields.ForeignKeyField('app.User')
    ...

And if user obtained like:

user = (await Session.objects.first()).user

print(type(user))  # <class 'tortoise.queryset.QuerySet'> but not CustomQuerySet

So, method defined in CustomQuerySet can not longer be used

Problem location:

There is a model tortoise.models.Model with method:

@classmethod
def filter(cls: Type[MODEL], *args: Q, **kwargs: Any) -> QuerySet[MODEL]:
    return cls._meta.manager.get_queryset().filter(*args, **kwargs)

And it uses queryset from cls._meta.manager
However cls._meta.manager is always tortoise.manager.Manager ignoring any objects = CustomManager(...) defined in final model, because of tortoise/models.py:MetaInfo:168:

class MetaInfo:
    __slots__ = (
        ...
    )

    def __init__(self, meta: "Model.Meta") -> None:
        self.abstract: bool = getattr(meta, "abstract", False)
        self.manager: Manager = getattr(meta, "manager", Manager())

Start in tortoise/models.py at MetaInfo.init and trace how Model.filter uses cls._meta.manager.get_queryset(). Compare that manager with the CustomManager declared on the concrete model, then check the relation-loading path using the example models. Done means related User instances preserve the custom queryset type and its methods.