fix #114233.

src/vs/workbench/contrib/notebook/browser/notebookServiceImpl.ts

@@ -631,6 +631,7 @@ export class NotebookService extends Disposable implements INotebookService, ICu
 			await this._extensionService.whenInstalledExtensionsRegistered();
 			// this awaits full activation of all matching extensions
 			await this._extensionService.activateByEvent(`onNotebook:${viewType}`);
+			await this._extensionService.activateByEvent(`onNotebook:*`);
 			if (this._notebookProviders.has(viewType)) {
 				return true;
 			} else {