add key

public/app/features/canvas/runtime/root.tsx

@@ -1,3 +1,5 @@
+import { Fragment } from 'react';
+
 import { CanvasFrameOptions } from '../frame';
 
 import { FrameState } from './frame';
@@ -49,7 +51,9 @@ export class RootElement extends FrameState {
         ref={this.setRootRef}
         style={{ ...this.sizeStyle, ...this.dataStyle }}
       >
-        {this.elements.map((v) => v.render())}
+        {this.elements.map((v) => (
+          <Fragment key={v.UID}>{v.render()}</Fragment>
+        ))}
       </div>
     );
   }