diff --git a/wp-includes/html-api/class-wp-html-processor.php b/wp-includes/html-api/class-wp-html-processor.php
index 3820fe0277..415ff23eea 100644
--- a/wp-includes/html-api/class-wp-html-processor.php
+++ b/wp-includes/html-api/class-wp-html-processor.php
@@ -786,13 +786,15 @@ class WP_HTML_Processor extends WP_HTML_Tag_Processor {
 	 *                   or `null` if not matched on any token.
 	 */
 	public function expects_closer( WP_HTML_Token $node = null ): ?bool {
-		$token_name      = $node->node_name ?? $this->get_token_name();
-		$token_namespace = $node->namespace ?? $this->get_namespace();
+		$token_name = $node->node_name ?? $this->get_token_name();
 
 		if ( ! isset( $token_name ) ) {
 			return null;
 		}
 
+		$token_namespace        = $node->namespace ?? $this->get_namespace();
+		$token_has_self_closing = $node->has_self_closing_flag ?? $this->has_self_closing_flag();
+
 		return ! (
 			// Comments, text nodes, and other atomic tokens.
 			'#' === $token_name[0] ||
@@ -803,7 +805,7 @@ class WP_HTML_Processor extends WP_HTML_Tag_Processor {
 			// Special atomic elements.
 			( 'html' === $token_namespace && in_array( $token_name, array( 'IFRAME', 'NOEMBED', 'NOFRAMES', 'SCRIPT', 'STYLE', 'TEXTAREA', 'TITLE', 'XMP' ), true ) ) ||
 			// Self-closing elements in foreign content.
-			( isset( $node ) && 'html' !== $node->namespace && $node->has_self_closing_flag )
+			( 'html' !== $token_namespace && $token_has_self_closing )
 		);
 	}
 
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 fb21c15d1d..95216b08a1 100644
--- a/wp-includes/html-api/class-wp-html-tag-processor.php
+++ b/wp-includes/html-api/class-wp-html-tag-processor.php
@@ -2921,7 +2921,7 @@ class WP_HTML_Tag_Processor {
 			return null;
 		}
 
-		$namespace = $this->get_namespace();
+		$namespace  = $this->get_namespace();
 		$lower_name = strtolower( $attribute_name );
 
 		if ( 'math' === $namespace && 'definitionurl' === $lower_name ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 6ec424afb2..2abc0eddf3 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-alpha-58868';
+$wp_version = '6.7-alpha-58870';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.