qmllint: False positive for required property

[RequiredLintTest]$ ~/Dokumente/toolchain-linux/dist/bin/qmllint Main.qml
Warning: Main.qml:9:2: Component is missing required property propTest from Usage [required]
	Usage {
	^^^^^

import QtQuick

Item {
	required property int myProp
}

import QtQuick

Item {
	property alias propTest: subItem.myProp

	Base {
		id: subItem

		myProp: 42
	}
}

import QtQuick

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

	Usage {
	}
}