diff -r 7b1b88e27a20 -r 48c4eec2b7e6 wp/wp-includes/sitemaps/class-wp-sitemaps-stylesheet.php
--- a/wp/wp-includes/sitemaps/class-wp-sitemaps-stylesheet.php	Thu Sep 29 08:06:27 2022 +0200
+++ b/wp/wp-includes/sitemaps/class-wp-sitemaps-stylesheet.php	Fri Sep 05 18:40:08 2025 +0200
@@ -14,6 +14,7 @@
  *
  * @since 5.5.0
  */
+#[AllowDynamicProperties]
 class WP_Sitemaps_Stylesheet {
 	/**
 	 * Renders the XSL stylesheet depending on whether it's the sitemap index or not.
@@ -21,15 +22,15 @@
 	 * @param string $type Stylesheet type. Either 'sitemap' or 'index'.
 	 */
 	public function render_stylesheet( $type ) {
-		header( 'Content-type: application/xml; charset=UTF-8' );
+		header( 'Content-Type: application/xml; charset=UTF-8' );
 
 		if ( 'sitemap' === $type ) {
-			// phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- All content escaped below.
+			// All content is escaped below.
 			echo $this->get_sitemap_stylesheet();
 		}
 
 		if ( 'index' === $type ) {
-			// phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- All content escaped below.
+			// All content is escaped below.
 			echo $this->get_sitemap_index_stylesheet();
 		}