Google had confirmed that within Search Console, they released their International Targeting report.
This report is specifically designed to help Webmasters with the implementation of href-lang attributes. It can help show errors in peoples code which, once fixed, will help Google attribute the correct regional pages to the regional searches.
Here’s an example of the International Targeting report:
This will help in the two main areas of Missing Return Links and incorrect href-lang values.
Have you used the new international targeting reports?