Map QML minimumZoomLevel changed when height or width changed

I'm creating a qml map in my app. I'm setting minimumZoomLevel to 3 (because the map I'm using start at 3). In my app, I can changed the window size. When I do this, the minimumZoomLevel is recalculated and becomes 2.XXX (inferior to 3). I'm also setting the maximumZoomLevel and this property doesn't changed when I resize the window.

Is this comportment the wanted one ?