Qt Creator mixes up types from different modules even if some qualifiers are used

In a simple test project like this:

import Qt.labs.platform 1.1 as QtLabs
import QtQuick 2.15
import QtQuick.Window 2.15
import QtQuick.Controls 2.15

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")    

    Dialog {
        width: 340
        height: 340
    }
}

Qt Creator seems to assume the Dialog to be from the labs module even though the import has been given a qualifier which is not used with "Dialog". So technically the Dialog should be from QQC2 but Qt Creator disagrees. This results in Qt Creator giving warnings about "invalid property name" while in reality the code would run fine.

Steps to reproduce the errors:

• Open the attached project in Qt Creator
• Open main.qml in editor

The workaround:

Add a qualifier for QQC2 as well. Example:

import Qt.labs.platform 1.1 as QtLabs
import QtQuick 2.15
import QtQuick.Window 2.15
import QtQuick.Controls 2.15 as QQC2

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    QQC2.Dialog {
        width: 340
        height: 340
    }
}

 In this case the errors disappear and autocompletion for code works well.