qmllint gives 'can be shadowed' warning first time accessing property of aliased item

With the following files I get this warning:

/usr/lib/qt6/bin/qmllint --compiler warning Test.qml
 Warning: Test.qml:6:16: Could not compile binding for onCompleted: Member someProp of QString of QString can be shadowed
 idRoot.idTest.someProp = "test"

Test.qml

import QtQuick

TestForm {
    id: idRoot
    Component.onCompleted: {
        idRoot.idTest.someProp = "test"
        idRoot.idTest.otherProp = "test2"
    }
}

TestForm.ui.qml

import QtQuick

Item {
    property alias idTest: idTestComponent

    TestComponent {
        id: idTestComponent
    }
}

TestComponent.qml

import QtQuick

Item {
    property string someProp
    property string otherProp
}

If I add '// qmllint disable' to the first assignment line in Test.qml, I do not get an error for the second line.

Moving Component.onComplete into TestForm.ui.qml silences the shadowing warning.

Qmllint seems to be aware of the properties though, as adding something like 'idRoot.idTest.badprop = "bad"' will give another warning and silence the shadowing warning.

The initial warning it self also seems a bit dubious as TestComponent is not a QString.