Memory that is mmap'ed for dynamic QML objects do not get munmap'ed after object destruction

import QtQuick 2.15
import QtQuick.Controls 2.15

ApplicationWindow {
    id: window
    visible: true
    width: 640
    height: 480

    property var vector: []

    Column {
        Button {
            text: "Create Objects"
            onClicked: {
                const N = 50000
                console.log("Creating", N, "objects...")
                for (let i = 0; i < N; ++i) {
                    let obj = objComp.createObject(window)
                    vector.push(obj)
                }
            }
        }
        Button {
            text: "Destroy Objects"
            onClicked: {
                console.log("Destroying", vector.length, "objects...")
                for (let i = 0; i < vector.length; ++i)
                    vector[i].destroy()
                vector = []
            }
        }
        Button {
            text: "Collect Garbage"
            onClicked: {
                console.log("Running garbage collector...")
                gc()
            }
        }
    }

    Component{
        id: objComp
        QtObject {
            //Component.onCompleted: console.log("QtObject created")
            //Component.onDestruction: console.log("QtObject destroyed")
        }
    }
}