What changed. Google said the search company “changed the way that it evaluates and reports errors in Product structured data.” Google did not provide any more details than that.

The impact of the change. As a result of that change, Google said “you may see changes in the number of Product entities and issues reported for your property, as well as a change in severity of some issues from errors to warnings.”

Google will annotate the report so that if you see a decrease or increase in these numbers, it might be related to the change Google made on its reporting end and nothing you changed on your end. Again, it might just be a reporting change and the Google search results have not changed.

Why we care. If you notice changes in the product rich results report in Google Search Console, do not panic, it is a confirmed change on Google’s end. If you didn’t make any changes to your site around this date, there is even less reason to be concerned.

You should still review all the errors, issues and warnings Google specified in this report and resolve those issues going forward.