Disappearing text on a Button on QtQuick Controls when the Dark theme is active on macOS

The problem occurs on macOS 13.0.1 with the app 

./qtdoc/examples/demos/addressbook

The app was built with Qt 6.5.0 beta1 installed from the Qt Maintainance tool.

Before starting the app, the macOS desktop had the Drak theme active (not the "Auto" with the Dark theme applied). 

Intially, the button is not shown on startup if the table is empty. It is shown with the first entry in the TableView by a Delegate on each entry.

The text on the button disappears if the app is in the foreground. It appears again if the app goes in the background. 

The problem does not occur if the Light theme is active.