Rating schema not working properly

Hello,
On version 4.0.0 you have added the missing “bestRating” and “worstRating” params to structured schema data. #25667.
But is not working properly. After testing them using Google′s structured data testing tool, we realized that many products with multiple reviews gets the following message: “Your rating value was out of the default range, you must provide best and worst values”.
For example, there are products with only reviews of 5 stars, and then, the aggregateRating shows a rating value of 5.16, which of course makes no sense at all…
Please we need you to fix this.
Thanks.