When the JSON API Search API facets module is enabled and used on D10 builds all JSON API Search Api requests fail with the error "input value 'page' contains a non-scalar value". The problem arises because D10 is now using Symfony InputBag and that requires all parameter fetches to return a scalar value. The 'page' parameter on JSON API requests is actually an array containing both 'offset' and 'limit' values which causes the non-scalar error.
The page parameter is fetched in jsonapi_search_api_facets/src/Plugin/facets/url_processor/JsonApiQueryString.php line 125 where the page offset value is removed from the parameters.
On D10 installation enable json_search_api_facets and crate a json api facets. Now any request to JSON API Search index will report an error if page[offset] and page[limit] are present in query string.
Closed: duplicate
1.0
Code
Faced same issue.
Already fixed here.
https://www.drupal.org/project/jsonapi_search_api/issues/3359968
🐛
Input value "page" contains a non-scalar value.
Fixed
Closing this one.