Although QtQuick.Item inherits from QtObject, QML types that inherit from Item only show inheritance information about QtObject within the Qt Quick module.

For example, https://doc.qt.io/qt-6/qml-qtquick-image-members.html shows information about QtObject but https://doc.qt.io/qt-6/qml-qtquick-controls-abstractbutton-members.html does not.

The problem appears to be that the qml-base-type attribute is not defined for the qmlclass element describing QtQuick.Item in the qtquick.index file.