Personalization Subject Override results in (no subject) about sendgrid-go HOT 5 CLOSED

func (sgi *SendGridInteractor) SendSendGridEmail(emailInfo SendGridEmailInfo) error {
	newV3Mail := mail.NewV3Mail()

	newV3Mail.SetFrom(mail.NewEmail(sgi.config.DefaultFromName, sgi.config.DefaultFromEmail))

	if emailInfo.TemplateId == "" {
		emailInfo.TemplateId = BaseTemplateWithMessageBodyId
	}

	newV3Mail.SetTemplateID(emailInfo.TemplateId)

	personalization := mail.NewPersonalization()
	tos := []*mail.Email{
		mail.NewEmail(emailInfo.ToName, emailInfo.ToEmail),
	}
	personalization.AddTos(tos...)

	for _, element := range *emailInfo.MessageBodyValues {
		personalization.SetDynamicTemplateData(element.Key, element.Value)
	}

	if emailInfo.Subject == "" {
		emailInfo.Subject = DefaultEmailSubject
	}

	// The subject can be overridden here, otherwise it uses the template subject.
	// Currently getting emails with (no subject) if it's overridden, but I've asked about this on the repo.
	// This doesn't resolve it either: --> newV3Mail.Subject = "OVERRIDE!"
	personalization.Subject = emailInfo.Subject
	newV3Mail.AddPersonalizations(personalization)

	request := sendgrid.GetRequest(sgi.config.SecretKey, sgi.config.Endpoint, sgi.config.Host)
	request.Method = "POST"
	request.Body = mail.GetRequestBody(newV3Mail)

	if err := sgi.port.SendSendGridRequest(&request); err != nil {
		return err
	}

	return nil
}