diff --git a/wp-includes/html-api/class-wp-html-tag-processor.php b/wp-includes/html-api/class-wp-html-tag-processor.php
index debc87321c..2e84b3d719 100644
--- a/wp-includes/html-api/class-wp-html-tag-processor.php
+++ b/wp-includes/html-api/class-wp-html-tag-processor.php
@@ -1743,7 +1743,7 @@ class WP_HTML_Tag_Processor {
 	 * @param string $prefix Prefix of requested attribute names.
 	 * @return array|null List of attribute names, or `null` when no tag opener is matched.
 	 */
-	function get_attribute_names_with_prefix( $prefix ) {
+	public function get_attribute_names_with_prefix( $prefix ) {
 		if ( $this->is_closing_tag || null === $this->tag_name_starts_at ) {
 			return null;
 		}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index a954fed417..9811d9686e 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.4-alpha-56300';
+$wp_version = '6.4-alpha-56301';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.