Blank payment notification emails

-- Joomla version -- : 3.8.10

We have been receiving the following blank order payment notification emails lately. The notifications do not include any date or order information.

They seem connected to the Paypal payment method. Any idea why these would be coming through?

Hikashop version is 3.5.0

Order

The order is now .

Hi ,


Hello, A paypal notification was received with the status . The order is now . This notification was for the order on the website www.countymaterials.com/
You can access the order details directly by clicking on the link below after logging in your back end:
/administrator/index.php?option=com_hikashop&ctrl=order&task=edit&order_id=

Summary of your order

Hi,

I would recommend updating your HikaShop as we've done some patches on the payment notifications since the 3.5.0
So it could be linked to that.
The screenshot indicates that the order id is not provided.
Do you get normal payment notification emails for the orders ? Are they confirmed automatically by the PayPal plugin ?
Normally, no email should be sent if the order id is missing from the notification or is invalid (which could happen if someone was trying to send fake payment notifications to you).