SignalSpy.qml triggers a memory leak in the QML engine

import QtQml
import QtTest

QtObject {
    id: mouseArea
    property SignalSpy spy: SignalSpy {
        signalName: "onObjectNameChanged"
        target: mouseArea
    }
}

import QtQml
import QtTest

QtObject {
    id: mouseArea
    property SignalSpy spy: SignalSpy {
        target: mouseArea
        signalName: "onObjectNameChanged"
    }
}