/**
 * Remove IE 'conditional' data from registered scripts/styles to avoid
 * WP 6.9 deprecation notice about WP_Dependencies->add_data( ..., 'conditional', ... )
 *
 * Put this in functions.php or as a mu-plugin (recommended: mu-plugin).
 */
add_action( 'plugins_loaded', 'mp_remove_ie_conditional_data', 20 );
function mp_remove_ie_conditional_data() {
    // Only run when WP Scripts/Styles are available.
    if ( ! function_exists( 'wp_scripts' ) || ! function_exists( 'wp_styles' ) ) {
        return;
    }

    global $wp_scripts, $wp_styles;

    // Helper to remove 'conditional' keys if present (handles different container properties)
    $remove_conditional = function( $container ) {
        if ( ! is_object( $container ) || empty( $container->registered ) ) {
            return;
        }
        foreach ( $container->registered as $handle => $obj ) {
            // WP stores extra data either in 'extra' or 'data' arrays depending on WP version
            if ( isset( $obj->extra ) && is_array( $obj->extra ) && isset( $obj->extra['conditional'] ) ) {
                unset( $container->registered[ $handle ]->extra['conditional'] );
            }
            if ( isset( $obj->data ) && is_array( $obj->data ) && isset( $obj->data['conditional'] ) ) {
                unset( $container->registered[ $handle ]->data['conditional'] );
            }
            // older code may have stored it directly on the object
            if ( property_exists( $obj, 'conditional' ) && ! empty( $obj->conditional ) ) {
                unset( $container->registered[ $handle ]->conditional );
            }
        }
    };

    // Remove conditional from scripts and styles
    $remove_conditional( $wp_scripts );
    $remove_conditional( $wp_styles );
}