[iOS] Color is not applied to all items when change it using 'sliders' tab from native picker

MacOS 13.6

Qt Creator 11.0.3

Device: iOS Simulator

Steps to reproduce:

1. Open flat style example: https://doc.qt.io/qt-6/qtquickcontrols-flatstyle-example.html
2. Run the example on iOS simulator/device
3. Click on the change color button.
4. When the native picker appears change the tab to the slider
5. Slide the sliders to change the color.
6. Close the picker.

Expected: The color of all items is changed.

Actual: Only the color of the 'change color' button is changed. See attached video for more details.

Reproducibility:  100% **