Seems like AJAX is not correctly refreshing the view upon facet selection. When using a facet on the first page of search results, there is no issue. Issue only presents itself when users activate a facet on a page beyond page 1 and there aren't enough items per page in that filter to reach the page they activate it from. On a page that shows no results, copy pasting the url and loading a page shows the results, debugging also indicates that there is no page # being set in AJAX. Also, the # of results is being correctly shown, so search/facets is recognizing that there are results, it is just not displaying them.
Have already tried the patches on https://www.drupal.org/project/facets/issues/3075378 🌱 [META] Overview of Facets + Ajax issues Active including https://www.drupal.org/files/issues/2021-08-25/facets-facets_with_ajax_n... → .
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I've had a similar issue when using facets combined with an exposed filter, in combination with the https://www.drupal.org/project/views_ajax_history → module.
Forcing the pager back to 0, as done in the patch, fixed the issue.
I can't see any reasons why facets should not reset the pager when filtering, therefor this patch seems a good solution to handle those edge cases.