Ensure Google is Able to Crawl All Resources Required for Mobile Friendliness
Content Hidden in Tabs on Mobile Sites Will Not Appear in Featured Snippets
Content which is contained behind a tab on a mobile site will not appear within featured snippets in search results, this is due to Google only wanting to show something in a snippet if they can be sure the user will be able to easily find the content when they visit the page.
Mobile-first Indexing Rolled Out to Over 50% of Websites
Google has switched over to mobile-first indexing for over 50% of websites and the team is on track with regards to rolling this out to the remainder of websites.