From time to time I get paypal express orders placed via checkout step 4 as open or backordered.
in access logs
Orders (create)
Incompleted -> Open
Orders (update)
Incompleted -> Backordered
"POST / HTTP/2.0" 200 3404 "https://www.domain.com/checkout.html" "Mozilla/5.0 (Macintosh; xxxxxxxxxxxxxxxxxxxxxxxxx "POST /index.php?dispatch=checkout.place_order HTTP/2.0" 200 92 "https://www.domain.com/checkout.html" "Mozilla/5.0 (Macintosh; xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" "POST /index.php?dispatch=payment_notification.paypal_ipn HTTP/1.1" 200 - "-" "PayPal IPN ( https://www.paypal.com/ipn )" "GET /index.php?dispatch=payment_notification.notify&payment=paypal_express&order_id=XXXX&token=EC-XXXXXXXXXXXXXXX&PayerID=XXXXXXXXXX HTTP/2.0" 302 - "https://www.domain.com/checkout.html" "Mozilla/5.0 (Macintosh; xxxxxxxxxxxxxxx "GET /index.php?dispatch=checkout.complete&order_id=8774 HTTP/2.0" 200 11837 "https://www.domain.com/checkout.html" "Mozilla/5.0 (Macintosh; xxxxxxxxxxxxxxxxxxxxxxxx
later in paypal ipn history page I re sent IPN msg and got
Status: Open -> Incompleted
Orders (status change)
Orders (update)
Incompleted -> Processed
"POST /index.php?dispatch=payment_notification.paypal_ipn HTTP/1.1" 200 - "-" "PayPal IPN ( https://www.paypal.com/ipn )"