Properties in QML are not allowed to start with a capital letter. The QML runtime will error out if it encounters properties declared in QML that begin with a capital letter, but QtCreator does not show any kind of warning or error in its code view.

QtCreator should show an error when a property declared in QML begins with a capital letter and should probably also show a warning for a QObject property with a capital letter in the beginning letting the user know that this is not allowed in QML.

This is related to https://bugreports.qt.io/browse/QTBUG-99638 in that QObject properties declared in C++ should also produce an error in when used in QML at runtime.