[Reg 6.8.3->6.9.0] Desktop virtual keyboard cannot find InputPanel.qml and freezes the application

A minimal reproducer is attached.

It is a QWidget-based application (a single QTextEdit) that requests input method to be virtual keyboard. That is doable and allowed:
https://doc.qt.io/qt-6/qtvirtualkeyboard-deployment-guide.html#integration-method

And it works well in 6.8.3. But since 6.9.0, the internal QQuickView cannot find InputPanel.qml anymore. Run the reproducer and one will be greeted by:

qrc:/qt-project.org/imports/QtQuick/VirtualKeyboard/InputPanel.qml: No such file or directory

And the entire process is mostly frozen. Mouse interactions are not working anymore, but one can still type in using physical keyboard.