diff -r 7b1b88e27a20 -r 48c4eec2b7e6 wp/wp-includes/post-thumbnail-template.php
--- a/wp/wp-includes/post-thumbnail-template.php	Thu Sep 29 08:06:27 2022 +0200
+++ b/wp/wp-includes/post-thumbnail-template.php	Fri Sep 05 18:40:08 2025 +0200
@@ -186,19 +186,6 @@
 			update_post_thumbnail_cache();
 		}
 
-		// Get the 'loading' attribute value to use as default, taking precedence over the default from
-		// `wp_get_attachment_image()`.
-		$loading = wp_get_loading_attr_default( 'the_post_thumbnail' );
-
-		// Add the default to the given attributes unless they already include a 'loading' directive.
-		if ( empty( $attr ) ) {
-			$attr = array( 'loading' => $loading );
-		} elseif ( is_array( $attr ) && ! array_key_exists( 'loading', $attr ) ) {
-			$attr['loading'] = $loading;
-		} elseif ( is_string( $attr ) && ! preg_match( '/(^|&)loading=/', $attr ) ) {
-			$attr .= '&loading=' . $loading;
-		}
-
 		$html = wp_get_attachment_image( $post_thumbnail_id, $size, false, $attr );
 
 		/**