PanelEditor: Fixes issue with data source picker not updating when selecting mixed data source (#32386)

public/app/features/dashboard/components/PanelEditor/PanelEditorQueries.tsx

@@ -55,6 +55,8 @@ export class PanelEditorQueries extends PureComponent<Props> {
       // trigger queries when changing data source
       setTimeout(this.onRunQueries, 10);
     }
+
+    this.forceUpdate();
   };
 
   render() {