[BUG] TypeError: cannot specify both default and default_factory about django-ninja HOT 5 OPEN

class Referrer(BaseModel):
    user = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
    landing_dt = models.DateTimeField(null=True, blank=True, help_text="The time when the user arrived at the target page via deep link")
    utm_source = models.CharField(max_length=255, null=True, blank=True, help_text="Referrer")
    utm_medium = models.CharField(max_length=255, null=True, blank=True, help_text="Marketing medium")
    utm_campaign = models.CharField(max_length=255, null=True, blank=True, help_text="Product, promotion code, slogan, etc.")
    utm_term = models.CharField(max_length=255, null=True, blank=True, help_text="Product keyword")
    utm_content = models.CharField(max_length=255, null=True, blank=True, help_text="Ad content")
    media_source = models.CharField(max_length=255, null=True, blank=True, help_text="AppsFlyer advertising media")
    campaign = models.CharField(max_length=255, null=True, blank=True, help_text="AppsFlyer advertising campaign")
    link = models.URLField(max_length=1000, null=True, blank=True, help_text="AppsFlyer advertising link")
    deep_link_value = models.CharField(max_length=255, null=True, blank=True, help_text="AppsFlyer deep link")
    deep_link_sub1 = models.CharField(max_length=255, null=True, blank=True, help_text="Additional value for AppsFlyer deep link")
    raw_data = models.JSONField(blank=True, default=dict, help_text="AppsFlyer raw data")

    class Meta:
        verbose_name = "Referrer"
        verbose_name_plural = "Referrers"

    def __str__(self) -> str:
        """Stringify the object of this model.
        This method is used in Django admin page.
        """
        return f"id: {self.id} user: {self.user}"