Possible garbage collector bug

import QtQml
 
QtObject {
    id: root
    property int sum: 0
    Component.onCompleted: {
        try {
            const handler = {};
            let target = {prop1: 1, prop2: 2, prop3: 3 };
 
            let proxy = Proxy.revocable(target, handler);
            target = null;
            for (var prop in proxy.proxy) {
                root.sum += 5 - prop[4]
                console.log(root.sum, prop);
                proxy.revoke()
                gc()
            }
        } catch (e) {
            console.log(e);
        }
        Qt.quit();
    }
}