I recently took a test driver's license and didn't have time to update my blog. During the period, I saw that there was an update in the background prompt, and I immediately updated it and ignored it. This led to an inexplicable BUG. In fact, I don’t know what went wrong or even when it happened. But the look of the page title is not quite right like this:

That is, the title and description all disappeared and the link is directly displayed. is still available in the settings. Go to the header and footer template file and find no BUG. The most important thing is I went to Google for a lap. I don't know if I described it incorrectly. This is an example. Anyway, I didn't search for any related content. I was very puzzled.

So I sacrificed the last move of the server maintenance, restore backup, I have a good habit, update the blog post will back up the server again (the service provider does not charge me anyway), so I first save the website data in the meter Disk > Tools > Export:

Save the exported file and restore the server to the most recent backup, then restore the contents of the backup, the update in the dashboard is still popped up, restarted after the update, the BUG still did not reproduce. So far the bug has been solved, but I don't know what went wrong. I have to record it and reproduce it in the future.