qmllint: "unused import" lint don't care about "required" types

For code below, qmlint reports that

Info: Test2.qml:2:1: Unused import at Test2.qml:2:1

import QtQuick.Controls 2.15
^^^^^^

But this is not true, usage of "ApplicationWindow" type requires "QtQuick.Controls" import.
And if line "import QtQuick.Controls 2.15" is removed, then during start of program I got: "ApplicationWindow is not a type" and load of suitable qml file failed.

import QtQuick 2.15
import QtQuick.Controls 2.15

Item {
   required property ApplicationWindow applicationWindow
}