fix: Set isInitialized to force immediate react node view rendering

packages/editor-ext/src/lib/subpages/subpages.ts

@@ -44,7 +44,7 @@ export const Subpages = Node.create<SubpagesOptions>({
       mergeAttributes(
         { "data-type": this.name },
         this.options.HTMLAttributes,
-        HTMLAttributes,
+        HTMLAttributes
       ),
     ];
   },
@@ -63,6 +63,9 @@ export const Subpages = Node.create<SubpagesOptions>({
   },
 
   addNodeView() {
+    // Force the react node view to render immediately using flush sync (https://github.com/ueberdosis/tiptap/blob/b4db352f839e1d82f9add6ee7fb45561336286d8/packages/react/src/ReactRenderer.tsx#L183-L191)
+    this.editor.isInitialized = true;
+
     return ReactNodeViewRenderer(this.options.view);
   },
 });