In April, Google began showing a warning label in the search results to the owner of the web site if their pages were not mobile friendly. So if you were a verified Search Console user for a site and a page showed up in the search results and that page was not mobile friendly, Google would add a label for you in the snippet that reads "your page is not mobile-friendly."
But recently, that label has been wrong for many pages.
I noticed it yesterday when I published the on the Nonsecure Collection Of Passwords In Chrome notice. In Google it shows me that the page is not mobile friendly - but it is.
Here is the screen shot from the search results - they still show as not mobile friendly to me this morning:
But the mobile friendly testing tool shows it as mobile friendly:
The site is a mobile friendly site, so all new content is mobile friendly. In fact, other stories don't show up with the label for me (at least the ones I spot checked).
I am not the only one who saw this. Jennifer Slegg spotted this also for her site and so did others.
I wonder if this is a weird bug or something else going on? I honestly thought by the next day it would show fine, but it still does not.
Forum discussion at Twitter.
Update: John Mueller implied this page was labeled as not mobile friendly because of it's page speed. Meaning slow pages may make a page not mobile friendly in Google's eyes. Plus we have native iOS and Android apps and we are AMP enabled. So shouldn't the mobile friendly work off AMP, since Google serves that page to mobile users?