This has been reported twice previously (one, two), but I haven't seen any response, and the issue persists.
The workaround described in the second of those two reports (manually submitting a "click" on the nonexistent "OK" button via the console) still works.
Any chance we can get this fixed so the console jank isn't necessary to clear the message?
Let me know if there's more info I can provide that would help reproduce/troubleshoot the issue.