Listview updating problems. related to: QQmlChangeSet. With fix!

When updating data in a model from C++, I have 2 possible delegate views in QML.

One view is a map with mapitems, which works perfectly.

But when I have opened another page in stackview, with a listview, it will not update like it should. It only updates when loading that page again.

The error that qml produces when viewing the listview is:
 
QObject::connect: Cannot queue arguments of type 'QQmlChangeSet'(Make sure 'QQmlChangeSet' is registered using qRegisterMetaType().)

I have narrowed down the problem to the file: "qqmlchangeset_p.h"
Which I found here:
https://code.woboq.org/qt5/qtdeclarative/src/qml/util/qqmlchangeset_p.h.html

The solution is:
Add the following line of code at line #148:
"Q_DECLARE_METATYPE(QQmlChangeSet);"

I have tested this at a local machine and it works flawless.
Suggested solution:
Update Qt source code accordingly.