Bar Graph disappears after a while in the Graph Gallery example app

MacOS 15.4.1

Qt Creator 17.0.0

Qt 6.10 beta 2

Steps to reproduce:

1. Open https://doc.qt.io/qt-6/qtgraphs-3d-widgetgraphgallery-example.html from Qt Creator's example tab (6.10.0).
2. Run the app using 6.10.0 b2 desktop kit.
3. Browse through the graphs (scatter, surface), then go back to the bar graph.
4. Leave the app in the background for a while. 
5. Get back to the app. 

Expected: The bar graph is still visible. 

Actual: The graph bar disappears.

Reproducibility:  100% **