Disable WP 6.9 buffer to fix FacetWP JSON error

<?php
/**
 ** disables new template enahncement buffer in WP 6.9 during facet's ajax refresh
 ** to disable WP's buffer completely, you can use 
 ** add_filter( 'wp_should_output_buffer_template_for_enhancement', '__return_false' );
 **/
add_filter( 'wp_should_output_buffer_template_for_enhancement', function( $should ) {
  if ( function_exists( 'FWP' ) && FWP()->request && FWP()->request->is_refresh ) {
    return false;
  }
  return $should;
} );