QML - letters randomly disappear when resizing label

import QtQuick 2.11
import QtQuick.Window 2.11 
import QtQuick.Controls 2.4
Window {
  visible: true
  width: 800
  height: 480
  title: qsTr("Hello World")
  Text {
    id: text1
    text: "TEXT"
    renderType: Text.NativeRendering
    x: 50
    y: 50
    font.pointSize: 22 // Happens with both pointSize and pixelSize
  }
  Button {
    id: increase
    y: 400
    x: 400
    text: "INCREASE"
    renderType: Text.NativeRendering
    onClicked: text1.font.pointSize = text1.font.pointSize + 1
  }
  Button {
     id: decrease
     y: 400
     text: "DECREASE"
     onClicked: text1.font.pointSize = text1.font.pointSize - 1
  }
}