Google has announced to website owners that particular reports in Search Console are delayed at the moment.
The issue affected the following AMP, Rich Results (Structured Data), Index Coverage, Hreflang, and Mobile Usability. The issue with those reports is caused by errors in the reporting pipeline.
The Google team tweeted this news and mentioned that this would not cause any trouble with search results.
Google promised to notify the users when the issue is fixed. No updates have been announced by this moment, which means the problem still exists.