There may (or may not) be an issue with the changes Google made back in February around consolidating around the canonical URL, which means the AMP, mobile, etc will all be counted towards the main URL's data in the performance report. This may not be happening correctly for some sites and Google is supposedly investigating this issue.
Fabio Assis asked John Mueller of Google about the issue and posted this screen shot on Twitter:
Did anyone else notice that "site traffic consolidation into canonical URLs" in late August stopped working?@googlewmc @JohnMu @methode @pedrodias#SEO #Webmasters #AskGoogleWebmasters pic.twitter.com/Vqu0ZlkwKM
— Fábio Assis (@fabio_seo) September 2, 2019
Pedro Dias, who is a former Googler, and a top contributor in the Google forums responded that this may be an issue and Google is investigating it. He said:
Very succinctly:
— Pedro Dias: ~/pedro$ (@pedrodias) September 2, 2019
1. Google is aware of this, and they're looking if it's a problem or not;
2. Mobile-Adaptive websites (m.) were always a weird configuration for mobile-first. If you can I'd look into moving towards responsive/
John later asked Fabio for the URL to investigate:
Can you give me the URL? Curious to take a look.
— 🍌 John 🍌 (@JohnMu) September 2, 2019
Nothing is yet confirmed but there may be issues with the Search Console performance reports, we will let you know if and what Google says, if they do.
Forum discussion at Twitter.
Update: Here is the latest on that topic:
— Fábio Assis (@fabio_seo) September 4, 2019
Thanks
— Fábio Assis (@fabio_seo) September 4, 2019