This is a mostly benign error: `Error while getting the named flows for document 35: Could not find node with given id` that happens when reloading a page. It seems that the frontend and backend are racing, or that the frontend is using a document id that becomes stale by the time the request reaches the backend. It seems that this code should go through DOMTree.requestDocument so it always gets the correct document id, but upon inspecting the protocol traffic it seems to request content flow list immediately before requesting the document. This failure is newly exposed by converting inspector model tests (tracked by https://webkit.org/b/129217) so the patch in that bug will mark the following tests as flaky: inspector/dom/content-flow-list.html inspector/dom/content-flow-content-removal.html
I don't see this anymore. Closing.