Ticket #52046: 52046.diff

src/js/_enqueues/vendor/tinymce/plugins/wordpress/plugin.js

@@ -16 +16 @@
                 wpTooltips = false;
 
         if ( $ ) {
+                // Runs as soon as TinyMCE has started initializing, while plugins are loading.
+                // Handlers attached after the `tinymce.init()` call may not get triggered for this instance.
                 $( document ).triggerHandler( 'tinymce-editor-setup', [ editor ] );
         }
 
@@ -540 +542 @@
                 });
 
                 if ( $ ) {
-                        $( document ).triggerHandler( 'tinymce-editor-init', [editor] );
+                        // Run on DOM ready. Otherwise TinyMCE may initialize earlier and handlers attached
+                        // on DOM ready of after the `tinymce.init()` call may not get triggered.
+                        $( function() {
+                                $( document ).triggerHandler( 'tinymce-editor-init', [editor] );
+                        });
                 }
 
                 if ( window.tinyMCEPreInit && window.tinyMCEPreInit.dragDropUpload ) {