Google Tweeted that within the Google Search Console, a sitemap index count reporting bug might be creating a problem.
Gary Illyes from Google tweeted , “We might have a problem with reporting the number of indexed URLs in the SC Sitemaps feature.” The good news he further added, is that “we're looking into it.”
Google Search Console is unsuitably reporting huge drops in the number of indexed pages for few websites. If you have found out recently that there is something wrong with your indexed pages in Search Console then it may be a Google bug.
There was a panic in the community after the Google was reported with an issue, a month ago as a drop in index counts was declared. The Google will start noticing the bug today or tomorrow, and hopefully, the issue will be resolved as early as possible.Google Might Have A Problem With Index Count Reporting!,