We fixed the behavior of the Write a Review button for certain configurations of the All-in-One Reviews widget 
Previously, the button on the main tab didn’t work when reviews were collected only from third-party platforms and the widget had just one source that supported review collection (meaning users could be redirected to leave a review there).
For example, this could happen with a widget that had one Google source and one custom source.
Now, in this scenario, clicking Write a Review opens a popup with the available platform where users can leave a review.