We fixed an issue where entering certain URLs in Site Diagnostic returned a "diagnostics failed" message.
The cause was URLs that point to a landing page that automatically forwards to a different address rather than to the actual content. Site Diagnostic now follows that one redirect to read the real page, so these sites are scored correctly.
When a page has almost no content to score for page structure, instead of a vague error we now carry your URL straight over to Page Structure Diagnostics. The flow continues to the next step without making you re-enter anything.
This reduces cases that looked like a failed diagnosis and makes sure that whatever page you enter, you're never stuck and always connected to a clear next step.