Hi @lmvn,
Thanks for the update and questions!
How did you manage to report it to the dev team @dcka?
We had reported this issue internally to our developers for further help, as we could not reproduce the hollow stars on a clean installation of WordPress, WooCommerce, and Storefront.
I am not seeing the hollow stars on a new test site running the latest WordPress 5.7.2, WooCommerce 5.4.1, and Storefront 3.7.0:
Link to image: https://d.pr/i/7Ryeao
Link to image: https://d.pr/i/VMU7b6
I would be interested in knowing how to do that so I can also help out fix this issue.
Great, thanks for your willingness to help!
As quite a few people have this problem, but we can’t seem to reproduce it on our side, it would be great if you could perform a full conflict test on your site or a staging copy of your site using a tool provided by your host or the WP Staging plugin.
The staging site should help you determine which plugin might be affecting how Storefront displays the review stars.
For reference, feel free to contribute directly to Storefront via its Github page here: https://github.com/woocommerce/storefront.
Please let us know if you have any further questions!