[Reg 5.15 -> 6.0] qmllint: Property "length" not found on type "QString"

I build qtdeclarative from 76a7c93f9b860e2f6fde2198edde19a5d704a97f .

For code below qmllint produces warning:

$ /usr/local/qt6_tools/bin/qmllint Test.qml 
Warning: Test.qml:7:48: Property "length" not found on type "QString"
        console.log("text.length", textInput.text.length);

qml Test.qml works just fine, and print resulted length, so this is valid QML code.

Not sure what error is, no special handling for "QString", or that qmllint can not understand that in JavaScript it has type "string". As I see for "string" there is special handling for "length" property.

import QtQuick 2.15

TextInput {
    id: textInput

    Component.onCompleted: {
        console.log("text.length", textInput.text.length);
    }
}