Hey there,
The ACF_Local_JSON class is calling get_stylesheet_directory() within its constructor before any filters are able to run on it:
// Update settings.
acf_update_setting( 'save_json', get_stylesheet_directory() . '/acf-json' );
acf_append_setting( 'load_json', get_stylesheet_directory() . '/acf-json' );
These calls should be made within an init hook or similar to give plugins or themes a chance to filter stylesheet_directory and/or stylesheet
This is causing a major breakage for us in WordPress 6.4 as the result of get_stylesheet_directory() is now memoized meaning our filters never run.