If a website using Algolia Recommend stopped populating Recommended products after August 2024, it could be related to the major release of the Recommend JavaScript API client v5.
https://github.com/algolia/algoliasearch-client-javascript/tree/main/packages/recommend
This version is a major release from v4 to v5 and is incompatible with the previous version.
That said, when the website loads this library without specifying a version like the following, it loads the latest library, which can cause an issue on the frontend.
<script src="https://cdn.jsdelivr.net/npm/@algolia/recommend"></script>
To prevent the issue, we recommend explicitly specifying the Recommend API client version on the frontend.
For example, you can use v4.24.0 by adding a script tag like the following.
<script src="https://cdn.jsdelivr.net/npm/@algolia/recommend@4.24.0"></script>