Ungrab does not work for Input Handlers

#include "UiHelper.h"

#include <QCoreApplication>
#include <QDebug>

UiHelper::UiHelper(QObject* parent)
    : QObject(parent) {}

void UiHelper::ungrabMouseAndTouchPoints(QQuickItem* item, bool recursive) const {
    if (item != nullptr) {
        qDebug() << "Ungrab:" << item << item->objectName();
        item->ungrabMouse();
        item->ungrabTouchPoints();
        if (recursive) {
            for (auto* child : item->childItems()) {
                this->ungrabMouseAndTouchPoints(child, recursive);
            }
        }
    }
}

import QtQuick 2.12
import QtQuick.Controls 2.5
import QtQuick.Layouts 1.3

import Ui 1.0

ApplicationWindow {
    visible: true
    width: 640
    height: 480

    ColumnLayout {
        anchors.centerIn: parent

        Button {
            id: button

            text: "Button"
            background: Rectangle {
                color: button.pressed ? "orange" : "lightGrey"
            }
        }
        MouseArea {
            id: mouseArea

            implicitWidth: 200
            implicitHeight: 100

            Rectangle {
                anchors.fill: parent
                color: mouseArea.pressed ? "orange" : "lightGrey"

                Label {
                    anchors.centerIn: parent
                    text: "MouseArea"
                }
            }
        }
        Item {
            id: tapHandlerContainer

            implicitWidth: 200
            implicitHeight: 100

            Rectangle {
                anchors.fill: parent
                color: tapHandler.pressed ? "orange" : "lightGrey"

                Label {
                    anchors.centerIn: parent
                    text: "TapHandler"
                }
            }
            TapHandler {
                id: tapHandler

                gesturePolicy: TapHandler.ReleaseWithinBounds
            }
        }
    }

    Timer {
        running: true
        interval: 4000
        repeat: true
        onTriggered: {
            UiHelper.ungrabMouseAndTouchPoints(button, false);
            UiHelper.ungrabMouseAndTouchPoints(mouseArea, false);
            UiHelper.ungrabMouseAndTouchPoints(tapHandlerContainer, false);
            console.debug("----");
        }
    }
}