In Qt 6.8.0 Beta3, when using the Graphs: 2D component, the clicked signal of the QBarSeries is not being emitted as expected. This issue prevents UI elements from being updated when the user clicks on a bar in the series.

Steps to Reproduce:

1. Create a simple Qt Quick application using Qt 6.8.0 Beta3.
2. Define a BarSeries with a set of BarSet items.
3. Implement the onClicked handler for the BarSeries.
4. Run the application and click on any bar within the series.

Expected Result:
The clicked signal should be emitted when a bar in the BarSeries is clicked, and the corresponding slot (e.g., onClicked) should be executed, updating the UI as defined in the handler.

Actual Result:
The clicked signal is not emitted when clicking on a bar. As a result, the UI does not update, and no console output is generated from within the onClicked handler.