diff --git a/wp-includes/block-patterns.php b/wp-includes/block-patterns.php
index 0498db7e01..8b922e7dd1 100644
--- a/wp-includes/block-patterns.php
+++ b/wp-includes/block-patterns.php
@@ -155,7 +155,7 @@ function _register_remote_theme_patterns() {
 	}
 
 	$request         = new WP_REST_Request( 'GET', '/wp/v2/pattern-directory/patterns' );
-	$request['slug'] = implode( ',', $pattern_settings );
+	$request['slug'] = $pattern_settings;
 	$response        = rest_do_request( $request );
 	if ( $response->is_error() ) {
 		return;
diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-pattern-directory-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-pattern-directory-controller.php
index 2deb3c7e7a..28f42fd5a4 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-pattern-directory-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-pattern-directory-controller.php
@@ -25,8 +25,8 @@ class WP_REST_Pattern_Directory_Controller extends WP_REST_Controller {
 	 * @since 5.8.0
 	 */
 	public function __construct() {
-		$this->namespace     = 'wp/v2';
-			$this->rest_base = 'pattern-directory';
+		$this->namespace = 'wp/v2';
+		$this->rest_base = 'pattern-directory';
 	}
 
 	/**
@@ -137,11 +137,7 @@ class WP_REST_Pattern_Directory_Controller extends WP_REST_Controller {
 		$raw_patterns = get_site_transient( $transient_key );
 
 		if ( ! $raw_patterns ) {
-			$api_url = add_query_arg(
-				array_map( 'rawurlencode', $query_args ),
-				'http://api.wordpress.org/patterns/1.0/'
-			);
-
+			$api_url = 'http://api.wordpress.org/patterns/1.0/?' . build_query( $query_args );
 			if ( wp_http_supports( array( 'ssl' ) ) ) {
 				$api_url = set_url_scheme( $api_url, 'https' );
 			}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 57b40480c4..a4e328df30 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.0-beta1-53217';
+$wp_version = '6.0-beta1-53218';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.