Ticket #34640: 34640.diff

src/wp-includes/js/twemoji.js

@@ -89 +89 @@
        */
       onerror: function onerror() {
         if (this.parentNode) {
+          this.setAttribute( 'data-error', 'load-failed' );
           this.parentNode.replaceChild(createText(this.alt), this);
         }
       },

src/wp-includes/js/wp-emoji.js

@@ -58 +58 @@
                                                         ii === 1 && removedNodes.length === 1 &&
                                                         addedNodes[0].nodeType === 3 &&
                                                         removedNodes[0].nodeName === 'IMG' &&
-                                                        addedNodes[0].data === removedNodes[0].alt
+                                                        addedNodes[0].data === removedNodes[0].alt &&
+                                                        'load-failed' === removedNodes[0].getAttribute( 'data-error' )
                                                 ) {
                                                         return;
                                                 }