Back in April 2021, we shared a product reviews update that was designed to promote high quality product reviews. We are now rolling out a new update, the first major update since April, that may change how your product reviews rank in search results. In particular, if you have made positive changes to your content, you may see that improvement reflected as part of this latest release. However, note that our automated assessment of product review content is only one of many factors used in ranking content, so changes can happen at any time for various reasons.

Source from https://developers.google.com/search/blog/2021/12/product-reviews-update-and-your-site

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