What does Unknown mean on a WooCommerce order?
It means the plugin will not name the buyer. The request was not an ordinary browser, or someone sent a signature that did not check out. It is not a fraud verdict.
curl, a headless browser, and a crawler that is not a shopping agent land here. So does a request that claims to be ChatGPT and fails the key check. A real customer in Chrome does not.
Open the order box. The detail line says which of those it was. The order is still yours to fulfill. Nothing was cancelled.