[Reg 6.2->6.3] Component.createObject() no longer copies QQmlListProperty values correctly

import QtQuick
import People

Window {
    id: root
    width: 640
    height: 480
    visible: true

    Person { id: h0; name: "Bob Jones" }
    Person { id: g1; name: "Leo Hodges" }
    Person { id: g2; name: "Jack Smith" }
    Person { id: g3; name: "Anne Brown" }

    BirthdayParty {
        id: party1
        host: h0
        guests: [g1, g2, g3]
    }
    Component {
        id: partyComp
        BirthdayParty {}
    }

    function announceParty(party: BirthdayParty) {
        console.log(`${party.host.name} is having ${party.guests.length} guests. They are:`)
        for (let i = 0; i < party.guests.length; ++i)
            console.log('\t', party.guests[i].name)
    }

    Component.onCompleted: {
        let party2 = partyComp.createObject(root, { host: h0, guests: [g1, g2, g3] });

        announceParty(party1)
        announceParty(party2)
    }
}