PySide2 QML hangs without any error message when version >= 5.14.2

On macOS and Windows, PySide2 QML hangs without any error message when version >= 5.14.2.

Here is my repo: https://github.com/leovan/SciHubEVA

All resources need to be compiled with the follow command before run the app.

pyside2-rcc SciHubEVA.qrc -o scihub_eva/resources.py

When choosing PySide2 version 5.14.1, everything works fine. For version >= 5.14.2, I tried to debug, it seems hangs at

self._engine.load('qrc:/ui/SciHubEVA.qml')

I also tried to figure out what's wrong with QML files, after I comment most of code in QML file, I found if I remove Qt.labs.platform related codes, it does not hang anymore.

Thus, I don't know whether it's a bug or there is some breaking changes with version 5.14.2.