https://forum.qt.io/topic/160671/qmlregistertypesingleton-with-contextdata-error-while-using-pyside6
qmlRegisterTypeSingleton with contextData error while using PySide6 | Qt Forum
Feb 4, 2025 - I've been having this issue for a long time now. The existing code worked fine for years and didn't start failing until after a QT update over six months ago...
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