Layout.width = height Initial Value does not seem to be applied any longer

In Qt < 6.4 the following assignment in a Layout gets properly initialized when the height itself is dependent on other bindings:

Button {
Layout.maximumWidth: height
Layout.minimumWidth: height
}

In Qt6.4 something seems to be wonky with the initialization order / binding order.

The button is, upon startup of the application not square as expected. It rather is rectangular. Once you click the button and a secondary toolbar is shown which changes the height of the whole top toolbar, the buttons are square and stay square.

I have attached a minimal demo project.