diff --git a/wp-includes/html-api/class-wp-html-processor.php b/wp-includes/html-api/class-wp-html-processor.php
index 39196499fa..4bdb75fcac 100644
--- a/wp-includes/html-api/class-wp-html-processor.php
+++ b/wp-includes/html-api/class-wp-html-processor.php
@@ -464,7 +464,7 @@ class WP_HTML_Processor extends WP_HTML_Tag_Processor {
 	 * @return static|null The created processor if successful, otherwise null.
 	 */
 	public function create_fragment_at_current_node( string $html ) {
-		if ( $this->get_token_type() !== '#tag' ) {
+		if ( $this->get_token_type() !== '#tag' || $this->is_tag_closer() ) {
 			return null;
 		}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 0aee31198d..2d926d0b9c 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.8-alpha-59449';
+$wp_version = '6.8-alpha-59450';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.