Google Is Testing a New Rich Snippet Single Star Style on Mobile with a Single Star and Review Score Number
https://www.seroundtable.comGoogle is testing showing just a single star icon for the star rich results, in this test they show the rating out of five along with the single star and the number of reviews in brackets.
Sample Query: Try searching for dyson v11 review on Mobile. I was NOT able to trigger the result from Australia or USA.