Apparently QDoc will drop the type of the first method parameter present in a \qmlmethod:

For example, the "Qt.rect" method is documented in src\qml\qml\v8\qqmlbuiltinfunctions.cpp  as follows:

 
/*!
    \qmlmethod rect Qt::rect(int x, int y, int width, int height)

    Returns a rect with the top-left corner at \a x, \a y and the specified \a width and \a height.
*/
 
In the online documentation however, the method is documented as follows, and is missing the type for the first parameter:
"rect rect(x, int y, int width, int height)"

When looking at the online docs, this seems to be the case for all \qmlmethod's:

https://doc-snapshots.qt.io/qt6-dev/qml-qtqml-qt.html #rect-method

https://doc.qt.io/qt-5/qml-qtqml-qt.html#rect-method

This affects both the current and dev version.