Hi Adrien, it seems like Qt doesn’t find the plugins to load (although it does find eglfs QPA).
Here are some command you can export in command line to give you some debugging information:
sudo rm /opt/oxide/.started
export QT_LOGGING_RULES=qt.qpa.*=true
export QT_DEBUG_PLUGINS=1
And execute `/opt/qt5/bin/qmlscene` directly to see if it loads.