Google announced that they have made alterations in the way in which index coverage status report functions around websites that have been moved to the mobile-first indexing process. Google mentioned that presently, the new issues and the error counts will showcase the status of mobile-first indexing. So, the report will not reflect the desktop error. It will show the mobile errors if the website was moved to mobile-first indexing. This has no bearing in a website’s ranking in Google search and it is only a reporting change in that particular report in the Google Search Console.
Forum discussion at Twitter.