The problem solved (after explore django source code): The permissions field in AbstractGroup model must have related_query_name as "group".

class AbstractGroup(models.Model):
    name = models.CharField(_("name"), max_length=150, unique=True)
    permissions = models.ManyToManyField(
        Permission,
        verbose_name=_("permissions"),
        blank=True,
        related_name="custom_group",
        related_query_name="group",
    )
    ...

Thanks.