[Dialog QML] Dialog becomes dark after putting the app in the background and resuming it back with iOS style

Steps to reproduce:

1. Open any example with Dialog QML implementation, e.g.: https://doc.qt.io/qt-6/qtquickcontrols-gallery-example.html.
2. Open the dialog, so that it is displayed on the screen.
3. Put the app in the background
4. Resume the app back to the foreground

Expected: The look of the dialog does not change.

Actual: Dialog becomes dark, also some other elements are also dark, like the drawer background in the mentioned example. 

Reproducibility:  100%

NOTE: This happens only on iOS with iOS style applied.