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Google posted on the webmaster blog today that  they have updated the review rich  rules for how and when it shows the reviews rich results. Search results that are enhanced by review rich results can be extremely helpful when searching for products or services (the scores and/or “stars” you sometimes see alongside search results).
Google said that to make the review rich results more helpful and meaningful, they are now introducing algorithmic updates to reviews in rich results.

The main takeaway from this is that if the functionality of posting the reviews on the site is such that they can be moderated or updated then they will not be shown. This applies to even the reviews posted via the third party widgets.

@JohnMu might be able to say better but I think the post is clear that if a website ultimately controls the reviews about itself, we won’t display those whether it’s through direct markup or a third-party widget.

— Danny Sullivan (@dannysullivan) September 16, 2019

With this change, Google has also  limited the pool of schema types that can potentially trigger review rich results in search. Specifically, they will only display reviews with those types (and their respective subtypes):

• schema.org/Book
• schema.org/Course
• schema.org/CreativeWorkSeason
• schema.org/CreativeWorkSeries
• schema.org/Episode
• schema.org/Event
• schema.org/Game
• schema.org/HowTo
• schema.org/LocalBusiness
• schema.org/MediaObject
• schema.org/Movie
• schema.org/MusicPlaylist
• schema.org/MusicRecording
• schema.org/Organization
• schema.org/Product
• schema.org/Recipe
• schema.org/SoftwareApplication

According to Google:

Reviews that can be perceived as “self-serving” aren’t in the best interest of users. We call reviews “self-serving” when a review about entity A is placed on the website of entity A – either directly in their markup or via an embedded 3rd party widget. That’s why, with this change, we’re not going to display review rich results anymore for the schema types LocalBusiness and Organization (and their subtypes) in cases when the entity being reviewed controls the reviews themselves.[/ffb_param][/ffb_paragraph_0]