[REG 5.14->5.15] crash on close in QQuickItemLayer destructor on Linux

import QtQuick 2.14
import QtQuick.Controls 2.3
import QtQuick.Layouts 1.3
import QtQuick.Window 2.14

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Menubar regression Qt 5.14 -> 5.15")
    menuBar: Item {
            id: root
            height: 44
            visible: true
            implicitWidth: headerItems.implicitWidth

            Rectangle {
                anchors.fill: parent
                color: "gray"
            }

            Rectangle {
                id: bottomDivider
                anchors {
                    left: parent.left
                    right: parent.right
                    bottom: parent.bottom
                }
                height: 1
                color: "black"
                z: 1
            }

            RowLayout {
                id: headerItems
                anchors {
                    top: parent.top
                    left: parent.left
                    right: parent.right
                    bottom: bottomDivider.top
                }
                spacing: 4

                MenuBar {
                    id: mainMenuBar
                    implicitHeight: headerItems.height
                    delegate: MenuBarItem {
                        id: menuBarItem
                        contentItem: Text {
                            text: menuBarItem.text
                            textFormat: Text.StyledText
                            opacity: enabled ? 1.0 : 0.3
                            horizontalAlignment: Text.AlignLeft
                            verticalAlignment: Text.AlignVCenter
                            elide: Text.ElideRight
                        }
                        background: Rectangle {
                            implicitHeight: mainMenuBar.height
                            opacity: enabled ? 1 : 0.3
                            color: "#eee"
                        }
                    }
                    Layout.alignment: Qt.AlignLeft | Qt.AlignVCenter

                    Menu {
                        title: qsTr("File")
                        MenuItem {
                            text: qsTr("Placeholder")
                        }
                        Action {
                            text: qsTr("Quit")
                            onTriggered: Qt.quit()
                            shortcut: "Ctrl+Q"
                        }
                    }

                Item {
                    id: flexibleSpaceRight
                    Layout.fillWidth: true
                }
            }
        }
    }
}