Ticket #56930: 56930.diff

src/wp-includes/media.php

@@ -1736 +1736 @@
         // By default add to all 'img' and 'iframe' tags.
         // See https://html.spec.whatwg.org/multipage/embedded-content.html#attr-img-loading
         // See https://html.spec.whatwg.org/multipage/iframe-embed-object.html#attr-iframe-loading
-        $default = ( 'img' === $tag_name || 'iframe' === $tag_name );
+        $default = false !== $context && ( 'img' === $tag_name || 'iframe' === $tag_name );
 
         /**
          * Filters whether to add the `loading` attribute to the specified tag in the specified context.