PayPal Orders Not Triggering New Order Emails, Magento 1.14.3.10

Question

When receiving orders via PayPal Express checkout the customers are not receiving a new order email. The new order emails work correctly when orders are paid via Sagepay. Currently having to go into each PayPal order and click the "Send Email" button, otherwise the customer won't receive the new order email. Any idea what I could check or change to correct this issue?