John Mueller said in this morning’s video that Google has changed how it handles soft 404 detection saying it looks at desktop vs mobile differently but in Search Console only reports what it shows in mobile and not on desktop. So if Google sees your mobile site showing a soft 404 for a specific page, it will label it as such but the desktop site might still show up in the search results for that page. John said this is new and kind of surprised him when he heard it.