If there are two sibling mouse areas stacked on top of each other and they both accept left mouse button press events, after forwarding the QMouseEvent to QQuickWindow, QEvent::isAccepted() will not return true.

import QtQuick

Rectangle {
    color: "red"

    MouseArea {
        anchors.fill: parent
        onPressed: (mouse) => {
            console.log("mouse area 1");
        }
    }

    MouseArea {
        anchors.fill: parent
        onPressed: (mouse) => {
            console.log("mouse area 2");
            mouse.accepted = true;
        }
    }
}

The attached demo shows the issue. It forwards a fake mouse button press event to the quick view and even though the second mouse area accepts the press event, event.isAccepted() returns false, which is unexpected.