Window in window contentHeight ignored?

[may-day]

It seems the contentHeight of a window inside a window is ignored or maybe overwritten by some handler?. E.g:

class WindowApp: Application(){
    override fun start(){
        root("kvapp"){
            window("OuterWindow",
                contentWidth=600.px,
                contentHeight=600.px,
                isResizable = false) {
                window("InnerWindow",
                    contentWidth=200.px,
                    contentHeight=200.px,
                    isResizable = false) {
                    +"The contentHeight seems to be ignored while the contentWidth apparently not."
                }
            }
        }
    }
}

[may-day]

Works now in 8.1.0. Thank you.