This has been driving me nuts and i have found the issue but not why the issue was there to begin with. It was two particular orders with PayPal express as the gateway, basically the the value of _transaction_id in the wp_postmeta table is “”O:8:”WC_Order”:1:{s:5:”�*�id”;i:5137;}” which is clearly not what it should be. I placed the real value from PayPal in there and I can now access my orders and the problem orders. Can i tell you why this happened, no. I have no idea cannot find much on the topic either.
