При попытке добавить комментарий к любой ошибке появляется большое красное поле с надписью:
It looks like you didn't come from the right page. One reason could be that you entered the URL in the address bar of your web browser directly, which should be safe. Another reason could be that you clicked on a URL which redirected you here without your consent.

Are you sure you want to commit these changes? 

Делаю просто: пишу в окошке комментарий и нажимаю Сохранить. Попробовал на двух разных багах.